{"id":4877,"date":"2026-03-30T20:11:35","date_gmt":"2026-03-30T18:11:35","guid":{"rendered":"https:\/\/nicolaslouis.com\/wordpress\/?p=4877"},"modified":"2026-04-01T14:43:55","modified_gmt":"2026-04-01T12:43:55","slug":"realiser-un-cyanotype","status":"publish","type":"post","link":"https:\/\/nicolaslouis.com\/wordpress\/2026\/03\/30\/realiser-un-cyanotype\/","title":{"rendered":"R\u00e9aliser un cyanotype"},"content":{"rendered":"\n\n\n\n\n\nR\u00e9aliser un cyanotype<\/title>\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:wght@400;500;600&family=EB+Garamond:ital,wght@0,400;0,600;1,400&display=swap\" rel=\"stylesheet\">\n<style>\n:root {\n --c-bg: #ffffff;\n --c-surface: #ffffff;\n --c-border: #e2ddd6;\n --c-border-md: #cec8be;\n --c-text: #1a1714;\n --c-muted: #6b6560;\n --c-faint: #9c958d;\n --c-accent: #37658b;\n --c-accent-lt: #e8f0eb;\n --c-warm: #f5f0e8;\n --c-amber: #7a4e0a;\n --c-amber-lt: #fdf0d5;\n --c-danger: #8a1f1f;\n --c-danger-lt: #fce8e8;\n --font-body: 'EB Garamond', Georgia, serif;\n --font-ui: 'DM Sans', system-ui, sans-serif;\n --r: 10px;\n}\n*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n\/* \u2500\u2500 Wrapper \u2500\u2500 *\/\n.cy {\n background: var(--c-bg);\n border: 1px solid var(--c-border);\n border-radius: var(--r);\n padding: 22px 16px 26px;\n font-family: var(--font-ui);\n color: var(--c-text);\n max-width: 100%;\n}\n\n\/* \u2500\u2500 Hero \u2500\u2500 *\/\n.cy-hero {\n background: var(--c-accent);\n border-radius: 8px;\n padding: 22px 20px 20px;\n margin-bottom: 20px;\n position: relative;\n overflow: hidden;\n}\n.cy-hero::before {\n content: '';\n position: absolute;\n bottom: -40px; right: -40px;\n width: 130px; height: 130px;\n border-radius: 50%;\n background: rgba(255,255,255,.04);\n pointer-events: none;\n}\n.cy-hero::after {\n content: '';\n position: absolute;\n top: -20px; left: -20px;\n width: 80px; height: 80px;\n border-radius: 50%;\n background: rgba(255,255,255,.03);\n pointer-events: none;\n}\n.cy-kicker {\n font-size: 10px; font-weight: 600;\n letter-spacing: .1em; text-transform: uppercase;\n color: rgba(255,255,255,.5);\n margin-bottom: 8px;\n}\n.cy-hero h1 {\n font-family: var(--font-body);\n font-size: 22px; font-weight: 600;\n color: #fff; line-height: 1.25;\n margin-bottom: 8px;\n letter-spacing: -0.01em;\n}\n.cy-hero-sub {\n font-size: 13px; color: rgba(255,255,255,.7);\n line-height: 1.6; font-style: italic;\n font-family: var(--font-body);\n margin-bottom: 14px;\n}\n.hero-tags { display: flex; flex-wrap: wrap; gap: 6px; }\n.htag {\n font-size: 11px; font-weight: 500;\n padding: 3px 10px; border-radius: 20px;\n background: rgba(255,255,255,.12);\n color: rgba(255,255,255,.8);\n border: 1px solid rgba(255,255,255,.18);\n}\n\n\/* \u2500\u2500 Intro chimique \u2500\u2500 *\/\n.cy-intro {\n background: var(--c-accent-lt);\n border: 1px solid #b8d4c0;\n border-left: 4px solid var(--c-accent);\n border-radius: 0 8px 8px 0;\n padding: 14px 16px;\n margin-bottom: 20px;\n font-size: 13.5px;\n color: var(--c-text);\n line-height: 1.7;\n}\n.cy-intro strong { color: var(--c-accent); font-weight: 600; }\n.cy-intro em { font-style: italic; color: var(--c-muted); }\n\n\/* \u2500\u2500 Progression des \u00e9tapes \u2500\u2500 *\/\n.cy-progress {\n display: flex;\n gap: 0;\n margin-bottom: 18px;\n border: 1px solid var(--c-border);\n border-radius: 8px;\n overflow: hidden;\n}\n.prog-step {\n flex: 1;\n display: flex;\n flex-direction: column;\n align-items: center;\n padding: 8px 4px;\n font-size: 9px;\n font-weight: 600;\n letter-spacing: .03em;\n text-transform: uppercase;\n color: var(--c-faint);\n text-align: center;\n background: var(--c-surface);\n border-right: 1px solid var(--c-border);\n gap: 4px;\n cursor: pointer;\n -webkit-tap-highlight-color: transparent;\n transition: background .15s;\n}\n.prog-step:last-child { border-right: none; }\n.prog-step:active { background: var(--c-warm); }\n.prog-num {\n width: 20px; height: 20px; border-radius: 50%;\n background: var(--c-border);\n font-size: 10px; font-weight: 700;\n color: var(--c-muted);\n display: flex; align-items: center; justify-content: center;\n}\n.prog-step.done .prog-num {\n background: var(--c-accent); color: #fff;\n}\n.prog-step.done { color: var(--c-accent); }\n\n\/* \u2500\u2500 Accord\u00e9ons \u2500\u2500 *\/\n.sections { display: flex; flex-direction: column; gap: 8px; }\n\n.sec {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 9px;\n overflow: hidden;\n transition: border-color .15s;\n}\n.sec.open { border-color: var(--c-border-md); }\n\n.sec-trigger {\n display: flex; align-items: center; gap: 12px;\n padding: 14px 16px;\n cursor: pointer; width: 100%;\n background: none; border: none;\n text-align: left; font-family: var(--font-ui);\n -webkit-tap-highlight-color: transparent;\n min-height: 56px;\n}\n.sec-trigger:active { background: #f5f0e8; }\n\n.sec-num {\n width: 30px; height: 30px; border-radius: 50%;\n background: var(--c-accent); color: #fff;\n font-size: 13px; font-weight: 600;\n display: flex; align-items: center; justify-content: center;\n flex-shrink: 0;\n}\n.sec-title-wrap { flex: 1; min-width: 0; }\n.sec-title {\n font-family: var(--font-body);\n font-size: 16px; font-weight: 600;\n color: var(--c-accent); line-height: 1.2;\n}\n.sec-sub {\n font-size: 12px; color: var(--c-faint);\n font-style: italic; margin-top: 2px;\n}\n.chevron {\n width: 18px; height: 18px; flex-shrink: 0;\n color: var(--c-faint);\n transition: transform .22s ease;\n}\n.sec.open .chevron { transform: rotate(180deg); }\n\n.sec-body {\n display: none;\n padding: 0 16px 18px;\n border-top: 1px solid var(--c-border);\n}\n.sec.open .sec-body { display: block; }\n\n\/* \u2500\u2500 Contenu \u2500\u2500 *\/\n.sec-intro {\n font-size: 14px; color: var(--c-text);\n line-height: 1.7; padding-top: 16px;\n margin-bottom: 16px;\n}\n\n.slabel {\n font-size: 10px; font-weight: 600;\n letter-spacing: .07em; text-transform: uppercase;\n color: var(--c-muted); margin-bottom: 8px;\n margin-top: 14px;\n}\n.slabel:first-child { margin-top: 0; }\n\n\/* \u2500\u2500 Param\u00e8tres rows \u2500\u2500 *\/\n.params { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }\n.prow {\n display: flex; align-items: flex-start; gap: 10px;\n background: var(--c-bg);\n border: 1px solid var(--c-border);\n border-radius: 8px; padding: 11px 12px;\n}\n.picon {\n width: 30px; height: 30px; border-radius: 7px;\n background: var(--c-accent-lt);\n display: flex; align-items: center; justify-content: center;\n flex-shrink: 0;\n}\n.picon svg { width: 15px; height: 15px; stroke: var(--c-accent); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }\n.pkey { font-size: 11px; font-weight: 600; color: var(--c-muted); margin-bottom: 3px; }\n.pval { font-size: 13.5px; color: var(--c-text); line-height: 1.5; }\n.pval em { color: var(--c-muted); font-style: italic; font-size: 12px; }\n\n\/* \u2500\u2500 Recette dosage \u2500\u2500 *\/\n.recette {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 8px; overflow: hidden;\n margin-bottom: 14px;\n}\n.recette-head {\n background: #f2ede6;\n padding: 8px 14px;\n font-size: 10px; font-weight: 600;\n letter-spacing: .07em; text-transform: uppercase;\n color: var(--c-muted);\n border-bottom: 1px solid var(--c-border-md);\n}\n.r-row {\n display: flex; align-items: flex-start;\n gap: 10px; padding: 10px 14px;\n border-bottom: 1px solid var(--c-border);\n}\n.r-row:last-child { border-bottom: none; }\n.r-qty {\n font-family: monospace; font-size: 13px;\n font-weight: 600; color: var(--c-accent);\n min-width: 68px; flex-shrink: 0; padding-top: 1px;\n}\n.r-desc { font-size: 13px; color: var(--c-text); line-height: 1.5; }\n.r-desc em { color: var(--c-muted); font-size: 12px; font-style: italic; }\n\n\/* \u2500\u2500 Steps num\u00e9rot\u00e9s \u2500\u2500 *\/\n.steps { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }\n.step {\n display: flex; align-items: flex-start; gap: 10px;\n padding: 11px 12px;\n border: 1px solid var(--c-border);\n border-radius: 8px; background: var(--c-bg);\n}\n.snum {\n width: 24px; height: 24px; border-radius: 50%;\n background: var(--c-accent); color: #fff;\n font-size: 12px; font-weight: 600;\n display: flex; align-items: center; justify-content: center;\n flex-shrink: 0; margin-top: 2px;\n}\n.stxt { font-size: 13.5px; color: var(--c-text); line-height: 1.6; }\n.stxt strong { color: var(--c-accent); font-weight: 600; }\n.stxt em { color: var(--c-muted); font-style: italic; font-size: 12px; }\n\n\/* \u2500\u2500 Tip \/ conseil \u2500\u2500 *\/\n.tip {\n background: var(--c-warm);\n border-left: 3px solid var(--c-accent);\n border-radius: 0 6px 6px 0;\n padding: 11px 13px;\n font-size: 13px; color: var(--c-muted);\n line-height: 1.65; margin-bottom: 14px;\n}\n.tip strong { color: var(--c-accent); font-weight: 600; }\n.tip em { font-style: italic; }\n\n\/* \u2500\u2500 Alerte amber \u2500\u2500 *\/\n.warn {\n background: var(--c-amber-lt);\n border-left: 3px solid var(--c-amber);\n border-radius: 0 6px 6px 0;\n padding: 11px 13px;\n font-size: 13px; color: var(--c-amber);\n line-height: 1.65; margin-bottom: 14px;\n}\n.warn strong { font-weight: 600; }\n\n\/* \u2500\u2500 Alerte danger \u2500\u2500 *\/\n.danger {\n background: var(--c-danger-lt);\n border-left: 3px solid var(--c-danger);\n border-radius: 0 6px 6px 0;\n padding: 11px 13px;\n font-size: 13px; color: var(--c-danger);\n line-height: 1.65; margin-bottom: 14px;\n}\n.danger strong { font-weight: 600; }\n\n\/* \u2500\u2500 Checklist ok\/ko \u2500\u2500 *\/\n.checks { display: flex; flex-direction: column; gap: 7px; margin-bottom: 14px; }\n.chk {\n display: flex; align-items: flex-start; gap: 9px;\n padding: 10px 12px;\n border: 1px solid var(--c-border);\n border-radius: 7px; background: var(--c-bg);\n}\n.cico {\n width: 20px; height: 20px; border-radius: 50%;\n flex-shrink: 0; margin-top: 2px;\n display: flex; align-items: center; justify-content: center;\n}\n.cico.ok { background: #d4e8d8; }\n.cico.ko { background: #f0d8d8; }\n.cico svg { width: 10px; height: 10px; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; fill: none; }\n.cico.ok svg { stroke: #2a6a3a; }\n.cico.ko svg { stroke: #8a2a2a; }\n.chk-txt { font-size: 13.5px; color: var(--c-text); line-height: 1.55; }\n.chk-txt em { color: var(--c-muted); font-style: italic; font-size: 12px; }\n\n\/* \u2500\u2500 Temps expo visuel \u2500\u2500 *\/\n.expo-bars { display: flex; flex-direction: column; gap: 9px; margin-bottom: 14px; }\n.expo-row { display: flex; align-items: center; gap: 10px; }\n.expo-lbl { font-size: 12px; color: var(--c-muted); width: 140px; flex-shrink: 0; line-height: 1.3; }\n.expo-bar-wrap { flex: 1; height: 14px; background: #ede8e0; border-radius: 7px; overflow: hidden; }\n.expo-bar { height: 100%; border-radius: 7px; background: var(--c-accent); }\n.expo-val { font-size: 11px; font-weight: 600; color: var(--c-text); width: 50px; text-align: right; flex-shrink: 0; }\n\n\/* \u2500\u2500 Sch\u00e9ma lumi\u00e8re \u2500\u2500 *\/\n.light-schema {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 8px; overflow: hidden;\n margin-bottom: 14px;\n}\n.light-schema svg { width: 100%; height: auto; display: block; }\n\n\/* \u2500\u2500 S\u00e9parateur \u2500\u2500 *\/\n.sep { border-top: 1px solid var(--c-border); margin: 14px 0; }\n\n\/* \u2500\u2500 R\u00e9sultat visuel \u2500\u2500 *\/\n.result-card {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 8px; overflow: hidden;\n margin-bottom: 14px;\n}\n.result-head {\n background: #f2ede6;\n padding: 8px 14px;\n font-size: 10px; font-weight: 600;\n letter-spacing: .07em; text-transform: uppercase;\n color: var(--c-muted);\n border-bottom: 1px solid var(--c-border-md);\n}\n.result-row {\n display: flex; align-items: center; gap: 12px;\n padding: 10px 14px;\n border-bottom: 1px solid var(--c-border);\n}\n.result-row:last-child { border-bottom: none; }\n.result-swatch {\n width: 28px; height: 28px; border-radius: 50%;\n flex-shrink: 0; border: 1px solid rgba(0,0,0,.1);\n}\n.result-label { font-size: 13px; font-weight: 600; color: var(--c-accent); }\n.result-desc { font-size: 12px; color: var(--c-muted); margin-top: 2px; }\n\n\/* \u2500\u2500 Footer \u2500\u2500 *\/\n.cy-footer {\n margin-top: 20px; padding-top: 16px;\n border-top: 1px solid var(--c-border);\n display: flex; flex-wrap: wrap; gap: 8px; align-items: center;\n}\n.fbadge {\n font-size: 11px; font-weight: 500;\n padding: 4px 12px; border-radius: 20px;\n border: 1px solid var(--c-border-md);\n color: var(--c-muted);\n}\n.fbadge.green { background: var(--c-accent-lt); color: var(--c-accent); border-color: #b8d4c0; }\n<\/style>\n<\/head>\n<body>\n\n<div class=\"cy\">\n\n <!-- \u2500\u2500 Hero \u2500\u2500 -->\n <div class=\"cy-hero\">\n <div class=\"cy-kicker\">Proc\u00e9d\u00e9 alternatif \u2014 Tutoriel<\/div>\n <h1>R\u00e9aliser son premier cyanotype<\/h1>\n <div class=\"cy-hero-sub\">De la sensibilisation du papier au tirage final \u2014 guide pas \u00e0 pas pour grands d\u00e9butants<\/div>\n <div class=\"hero-tags\">\n <span class=\"htag\">5 \u00e9tapes<\/span>\n <span class=\"htag\">D\u00e9butant<\/span>\n <span class=\"htag\">UV naturels ou artificiels<\/span>\n <span class=\"htag\">Faible co\u00fbt<\/span>\n <\/div>\n <\/div>\n\n <!-- \u2500\u2500 Encart principe \u2500\u2500 -->\n <div class=\"cy-intro\">\n <strong>Le principe :<\/strong> le cyanotype est l’un des proc\u00e9d\u00e9s photographiques les plus anciens et les plus accessibles. Il repose sur la r\u00e9action de deux sels de fer \u2014 le <strong>citrate ferrique ammoniacal<\/strong> et le <strong>ferricyanure de potassium<\/strong> \u2014 qui, m\u00e9lang\u00e9s et expos\u00e9s aux <strong>rayons ultraviolets<\/strong>, forment un pigment bleu insoluble : le <em>bleu de Prusse<\/em>. Aucune chambre noire, aucun agrandisseur \u2014 seulement de la lumi\u00e8re, de l’eau et deux produits chimiques.\n <\/div>\n<div style=\"margin: 14px 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2ddd6;\">\n <img decoding=\"async\"\n src=\"https:\/\/nicolaslouis.com\/wordpress\/wp-content\/uploads\/2026\/03\/anna-atkins-cyanotype-laurencia-pinnatifida-2.webp\n\"\n alt=\"Autochrome Lumi\u00e8re \u2014 description de l'image\"\n style=\"width: 100%; height: auto; display: block;\"\n \/>\n <div style=\"padding: 8px 14px; font-size: 12px; color: #9c958d; font-style: italic; background: #f5f0e8;\">\n Cyanotype Anna Atkins Laurencia pinnatifida\n <\/div>\n<\/div>\n\n <!-- \u2500\u2500 Barre de progression \u2500\u2500 -->\n <div class=\"cy-progress\">\n <div class=\"prog-step done\" onclick=\"openSec('s0')\">\n <div class=\"prog-num\">1<\/div>Mat\u00e9riel\n <\/div>\n <div class=\"prog-step\" onclick=\"openSec('s1')\">\n <div class=\"prog-num\">2<\/div>Sensibiliser\n <\/div>\n <div class=\"prog-step\" onclick=\"openSec('s2')\">\n <div class=\"prog-num\">3<\/div>Exposer\n <\/div>\n <div class=\"prog-step\" onclick=\"openSec('s3')\">\n <div class=\"prog-num\">4<\/div>Rin\u00e7age\n <\/div>\n <div class=\"prog-step\" onclick=\"openSec('s4')\">\n <div class=\"prog-num\">5<\/div>Finition\n <\/div>\n <\/div>\n\n <!-- \u2500\u2500 Accord\u00e9ons \u2500\u2500 -->\n <div class=\"sections\">\n\n <!-- \u00a71 Mat\u00e9riel -->\n <div class=\"sec open\" id=\"s0\">\n <button class=\"sec-trigger\" onclick=\"toggle('s0')\">\n <span class=\"sec-num\">1<\/span>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Mat\u00e9riel & produits<\/span>\n <span class=\"sec-sub\">Ce qu’il faut r\u00e9unir avant de commencer<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">Le cyanotype est l’un des proc\u00e9d\u00e9s photographiques les moins co\u00fbteux. Les deux produits chimiques essentiels sont disponibles chez des fournisseurs sp\u00e9cialis\u00e9s ou en kit pr\u00eat \u00e0 l’emploi.<\/p>\n\n <div class=\"slabel\">Les deux produits chimiques indispensables<\/div>\n <div class=\"recette\">\n <div class=\"recette-head\">Formule classique d’Herschel (1842)<\/div>\n <div class=\"r-row\">\n <div class=\"r-qty\">Solution A<\/div>\n <div class=\"r-desc\"><strong>Citrate ferrique ammoniacal<\/strong> (vert) <em>\u2014 20 g pour 100 ml d’eau distill\u00e9e<\/em><\/div>\n <\/div>\n <div class=\"r-row\">\n <div class=\"r-qty\">Solution B<\/div>\n <div class=\"r-desc\"><strong>Ferricyanure de potassium<\/strong> <em>\u2014 8 g pour 100 ml d’eau distill\u00e9e<\/em><\/div>\n <\/div>\n <div class=\"r-row\">\n <div class=\"r-qty\">M\u00e9lange<\/div>\n <div class=\"r-desc\">Parts \u00e9gales A + B <em>\u2014 m\u00e9langer juste avant le couchage, sous lumi\u00e8re att\u00e9nu\u00e9e<\/em><\/div>\n <\/div>\n <\/div>\n\n <div class=\"warn\"><strong>Pr\u00e9parer sous lumi\u00e8re att\u00e9nu\u00e9e.<\/strong> Une fois m\u00e9lang\u00e9e, la solution est sensible aux UV. Ne pas travailler sous lumi\u00e8re fluorescente vive ni en plein jour. Une lampe tungst\u00e8ne jaune ou une lumi\u00e8re de cuisine tamis\u00e9e suffisent.<\/div>\n\n <div class=\"slabel\">Le support<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\"><svg viewBox=\"0 0 24 24\"><rect x=\"3\" y=\"3\" width=\"18\" height=\"18\" rx=\"2\"\/><path d=\"M3 9h18M3 15h18\"\/><\/svg><\/div>\n <div><div class=\"pkey\">Papier recommand\u00e9<\/div><div class=\"pval\">Aquarelle 200\u2013300 g\/m\u00b2 <em>\u2014 Fabriano, Arches, Canson. \u00c9viter le papier photo brillant et le papier ordinaire 80 g.<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\"><svg viewBox=\"0 0 24 24\"><path d=\"M3 6h18M3 12h18M3 18h18\"\/><\/svg><\/div>\n <div><div class=\"pkey\">Alternatives<\/div><div class=\"pval\">Tissu coton ou lin naturel non appr\u00eat\u00e9 <em>\u2014 laver avant usage pour \u00e9liminer les r\u00e9sidus d’appr\u00eat<\/em><\/div><\/div>\n <\/div>\n <\/div>\n <div class=\"tip\"><strong>Pourquoi pas le papier ordinaire ?<\/strong> Le papier de bureau est trop fin et trop acide. Les fibres de cellulose courte n’ancrent pas bien le bleu de Prusse \u2014 les noirs seront faibles et les blancs sales.<\/div>\n\n <div class=\"slabel\">Le motif \u00e0 reproduire<\/div>\n <div class=\"checks\">\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>N\u00e9gatif num\u00e9rique imprim\u00e9 sur transparent<\/strong> \u2014 film jet d’encre mat (Pictorico, Fixxons) \u00e0 300\u2013600 dpi<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Photogramme<\/strong> \u2014 objets r\u00e9els pos\u00e9s directement sur le papier sensibilis\u00e9 (feuilles, dentelles, plumes, clefs\u2026) : id\u00e9al pour d\u00e9buter sans n\u00e9gatif<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Dessin sur calque<\/strong> ou feuille de papier sulfuris\u00e9 au marqueur noir opaque<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ko\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"2\" x2=\"10\" y2=\"10\"\/><line x1=\"10\" y1=\"2\" x2=\"2\" y2=\"10\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Photocopie laser sur transparent<\/strong> d\u00e9conseill\u00e9e pour d\u00e9buter <em>\u2014 le toner ne bloque pas suffisamment les UV, image tr\u00e8s faible<\/em><\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">L’outillage<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\"><svg viewBox=\"0 0 24 24\"><path d=\"M3 3l7 7M10 10l4 4M14 14l7 7\"\/><path d=\"M5 5a10 10 0 0 1 14 14\"\/><\/svg><\/div>\n <div><div class=\"pkey\">Application de la solution<\/div><div class=\"pval\">Pinceau large plat (Spalter) ou petite mousse <em>\u2014 largeur 4 \u00e0 6 cm id\u00e9ale<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\"><svg viewBox=\"0 0 24 24\"><rect x=\"2\" y=\"7\" width=\"20\" height=\"14\" rx=\"2\"\/><path d=\"M16 7V5a2 2 0 0 0-2-2h-4a2 2 0 0 0-2 2v2\"\/><\/svg><\/div>\n <div><div class=\"pkey\">Contact n\u00e9gatif \/ papier<\/div><div class=\"pval\">Vitre de cadre photo (3\u20134 mm) + pinces ou cadre presse<\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\"><svg viewBox=\"0 0 24 24\"><path d=\"M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z\"\/><\/svg><\/div>\n <div><div class=\"pkey\">Protection<\/div><div class=\"pval\">Gants nitrile + tablier <em>\u2014 le ferricyanure tache durablement les v\u00eatements<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\"><svg viewBox=\"0 0 24 24\"><path d=\"M20 7H4a2 2 0 0 0-2 2v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2V9a2 2 0 0 0-2-2z\"\/><path d=\"M16 21V5a2 2 0 0 0-2-2h-4a2 2 0 0 0-2 2v16\"\/><\/svg><\/div>\n <div><div class=\"pkey\">D\u00e9veloppement<\/div><div class=\"pval\">Bac ou \u00e9vier + eau courante froide<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <!-- \u00a72 Sensibilisation -->\n <div class=\"sec\" id=\"s1\">\n <button class=\"sec-trigger\" onclick=\"toggle('s1')\">\n <span class=\"sec-num\">2<\/span>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Sensibilisation du papier<\/span>\n <span class=\"sec-sub\">Pr\u00e9parer et enduire la surface \u2014 sous lumi\u00e8re att\u00e9nu\u00e9e<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">La sensibilisation consiste \u00e0 enduire uniform\u00e9ment le papier du m\u00e9lange ferrique. Cette \u00e9tape doit \u00eatre r\u00e9alis\u00e9e sous lumi\u00e8re att\u00e9nu\u00e9e et le papier doit s\u00e9cher dans l’obscurit\u00e9 compl\u00e8te avant l’exposition. Une couche trop \u00e9paisse produit des images plates ; trop fine, les noirs seront faibles.<\/p>\n\n <div class=\"slabel\">Pr\u00e9paration de la solution de travail<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">Dans un petit flacon ou verre en plastique, m\u00e9langer <strong>parts \u00e9gales de solution A et solution B<\/strong> <em>\u2014 pour une feuille A4 : 3 ml de A + 3 ml de B suffisent<\/em><\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">M\u00e9langer doucement sans cr\u00e9er de bulles. La solution prend une teinte <strong>vert-jaune<\/strong> \u2014 c’est normal.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\">Utiliser <strong>dans les 30 minutes<\/strong> suivant le m\u00e9lange. Au-del\u00e0, la sensibilit\u00e9 diminue.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">Application sur le papier<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">Poser le papier sur une surface de travail propre et plane. Fixer les coins avec du ruban adh\u00e9sif si besoin.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">5<\/div>\n <div class=\"stxt\">Verser la solution au centre du papier. \u00c9taler avec le Spalter en <strong>couche r\u00e9guli\u00e8re et fine<\/strong> \u2014 mouvements horizontaux puis verticaux en croix.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">6<\/div>\n <div class=\"stxt\">Ne pas repasser plusieurs fois au m\u00eame endroit \u2014 cela cr\u00e9e des sur-\u00e9paisseurs visibles apr\u00e8s tirage. <strong>Un seul passage crois\u00e9<\/strong> suffit.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>\u00c9paisseur id\u00e9ale :<\/strong> on doit voir l\u00e9g\u00e8rement le grain du papier \u00e0 travers la couche. Si la solution forme des flaques ou coule sur les bords, c’est trop \u00e9pais \u2014 \u00e9ponger les bords avec un essuie-tout.<\/div>\n\n <div class=\"slabel\">S\u00e9chage<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">7<\/div>\n <div class=\"stxt\">S\u00e9cher dans l’<strong>obscurit\u00e9 totale<\/strong> \u00e0 plat ou suspendu. Dur\u00e9e : 20 \u00e0 40 minutes \u00e0 temp\u00e9rature ambiante.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">8<\/div>\n <div class=\"stxt\">Le papier sec doit avoir une teinte <strong>vert-kaki uniforme<\/strong>. Des zones plus claires indiquent une couche in\u00e9gale.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"warn\"><strong>S\u00e8che-cheveux d\u00e9conseill\u00e9.<\/strong> La chaleur acc\u00e9l\u00e8re la d\u00e9gradation de la couche sensible avant m\u00eame l’exposition. Si vous s\u00e9chez \u00e0 l’air ti\u00e8de, maintenir \u00e0 moins de 30\u00b0C.<\/div>\n\n <div class=\"tip\"><strong>Conservation avant exposition :<\/strong> le papier sensibilis\u00e9 peut se garder 2 \u00e0 4 semaines dans une enveloppe noire ou un dossier opaque, \u00e0 l’abri de l’humidit\u00e9. Au-del\u00e0, la sensibilit\u00e9 diminue progressivement.<\/div>\n <\/div>\n <\/div>\n\n <!-- \u00a73 Exposition UV -->\n <div class=\"sec\" id=\"s2\">\n <button class=\"sec-trigger\" onclick=\"toggle('s2')\">\n <span class=\"sec-num\">3<\/span>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Exposition UV<\/span>\n <span class=\"sec-sub\">Temps, sources lumineuses, contr\u00f4le du contact<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">L’exposition est le moment o\u00f9 la lumi\u00e8re ultraviolette transforme les sels ferriques en bleu de Prusse, partout o\u00f9 elle n’est pas bloqu\u00e9e par le n\u00e9gatif ou les objets. C’est l’\u00e9tape la plus variable \u2014 chaque configuration lumineuse, chaque saison, chaque heure de la journ\u00e9e donnent des dur\u00e9es diff\u00e9rentes. La bande d’essai est indispensable pour trouver votre temps de r\u00e9f\u00e9rence.<\/p>\n\n <div class=\"slabel\">Montage du contact<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">Poser le papier sensibilis\u00e9 face enduite <strong>vers le haut<\/strong> sur le fond rigide.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Placer le n\u00e9gatif (face imprim\u00e9e vers le bas, en contact direct avec le papier) <em>\u2014 ou disposer vos objets photogrammes directement sur le papier.<\/em><\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\">Poser la vitre dessus. Serrer avec les pinces ou le cadre presse pour un <strong>contact parfait sur toute la surface<\/strong>.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Contact = nettet\u00e9.<\/strong> Un espace d’air, m\u00eame minime, entre le n\u00e9gatif et le papier provoque une diffusion de la lumi\u00e8re UV qui rend les contours flous. Appuyer fermement, surtout sur les bords.<\/div>\n\n <div class=\"slabel\">Sources UV et temps d’exposition<\/div>\n <div class=\"expo-bars\">\n <div class=\"expo-row\">\n <div class=\"expo-lbl\">Plein soleil \u00e9t\u00e9 (11h\u201315h)<\/div>\n <div class=\"expo-bar-wrap\"><div class=\"expo-bar\" style=\"width:20%\"><\/div><\/div>\n <div class=\"expo-val\">2\u20135 min<\/div>\n <\/div>\n <div class=\"expo-row\">\n <div class=\"expo-lbl\">Soleil printanier voil\u00e9<\/div>\n <div class=\"expo-bar-wrap\"><div class=\"expo-bar\" style=\"width:45%\"><\/div><\/div>\n <div class=\"expo-val\">8\u201315 min<\/div>\n <\/div>\n <div class=\"expo-row\">\n <div class=\"expo-lbl\">Ciel couvert lumineux<\/div>\n <div class=\"expo-bar-wrap\"><div class=\"expo-bar\" style=\"width:65%\"><\/div><\/div>\n <div class=\"expo-val\">20\u201335 min<\/div>\n <\/div>\n <div class=\"expo-row\">\n <div class=\"expo-lbl\">Insoleuse UV actinique<\/div>\n <div class=\"expo-bar-wrap\"><div class=\"expo-bar\" style=\"width:35%\"><\/div><\/div>\n <div class=\"expo-val\">8\u201315 min<\/div>\n <\/div>\n <div class=\"expo-row\">\n <div class=\"expo-lbl\">Lampe LED UV (395 nm)<\/div>\n <div class=\"expo-bar-wrap\"><div class=\"expo-bar\" style=\"width:50%\"><\/div><\/div>\n <div class=\"expo-val\">10\u201320 min<\/div>\n <\/div>\n <\/div>\n\n <div class=\"warn\"><strong>Ces dur\u00e9es sont des points de d\u00e9part.<\/strong> La puissance UV varie \u00e9norm\u00e9ment selon la saison, la latitude, l’heure et la m\u00e9t\u00e9o. En automne-hiver, multiplier par 3 \u00e0 5 les temps d’\u00e9t\u00e9.<\/div>\n\n <div class=\"slabel\">La bande d’essai \u2014 trouver son temps de r\u00e9f\u00e9rence<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">Couper une bande de papier sensibilis\u00e9. Placer le n\u00e9gatif dessus. Couvrir 4\/5 de la bande avec un carton opaque.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Exposer <strong>2 minutes<\/strong>. D\u00e9caler le carton pour d\u00e9couvrir une nouvelle section. Exposer encore 2 minutes. R\u00e9p\u00e9ter 5 fois.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\">D\u00e9velopper la bande (rin\u00e7age \u00e0 l’eau, \u00e9tape suivante). Vous obtenez des zones \u00e0 2, 4, 6, 8 et 10 minutes expos\u00e9es.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">La <strong>zone id\u00e9ale<\/strong> : blanc pur dans les hautes lumi\u00e8res + noir dense dans les ombres, sans que les noirs \u00ab\u00a0bavent\u00a0\u00bb dans les blancs.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">Reconna\u00eetre une bonne exposition<\/div>\n <div class=\"result-card\">\n <div class=\"result-head\">Lecture visuelle apr\u00e8s exposition (avant rin\u00e7age)<\/div>\n <div class=\"result-row\">\n <span class=\"result-swatch\" style=\"background:#7a9a8a\"><\/span>\n <div><div class=\"result-label\">Zones expos\u00e9es aux UV<\/div><div class=\"result-desc\">Deviennent gris-bleu terne \u2014 normal, le bleu de Prusse se r\u00e9v\u00e8le compl\u00e8tement au rin\u00e7age<\/div><\/div>\n <\/div>\n <div class=\"result-row\">\n <span class=\"result-swatch\" style=\"background:#8a9a5a\"><\/span>\n <div><div class=\"result-label\">Zones prot\u00e9g\u00e9es (sous le n\u00e9gatif)<\/div><div class=\"result-desc\">Restent vert-kaki \u2014 ce sont les hautes lumi\u00e8res qui partiront au rin\u00e7age<\/div><\/div>\n <\/div>\n <div class=\"result-row\">\n <span class=\"result-swatch\" style=\"background:#c8b89a\"><\/span>\n <div><div class=\"result-label\">Sous-exposition<\/div><div class=\"result-desc\">Zones uniform\u00e9ment p\u00e2les, peu de contraste \u2014 prolonger le temps<\/div><\/div>\n <\/div>\n <div class=\"result-row\">\n <span class=\"result-swatch\" style=\"background:#2a2a2a\"><\/span>\n <div><div class=\"result-label\">Sur-exposition<\/div><div class=\"result-desc\">Zones tr\u00e8s sombres, hautes lumi\u00e8res bouch\u00e9es \u2014 r\u00e9duire le temps<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <!-- \u00a74 Rin\u00e7age & d\u00e9veloppement -->\n <div class=\"sec\" id=\"s3\">\n <button class=\"sec-trigger\" onclick=\"toggle('s3')\">\n <span class=\"sec-num\">4<\/span>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Rin\u00e7age & d\u00e9veloppement<\/span>\n <span class=\"sec-sub\">L’image na\u00eet dans l’eau<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">Le d\u00e9veloppement du cyanotype est l’un des plus simples de tous les proc\u00e9d\u00e9s photographiques : il ne n\u00e9cessite que de l’eau froide courante. L’eau dissout et \u00e9vacue les sels ferriques non expos\u00e9s (les hautes lumi\u00e8res), r\u00e9v\u00e9lant le fond blanc du papier. Le bleu de Prusse, lui, est insoluble et reste ancr\u00e9 dans les fibres.<\/p>\n\n <div class=\"slabel\">Protocole de rin\u00e7age<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\"><strong>Immerger dans l’eau froide<\/strong> \u2014 bac ou \u00e9vier. La feuille peut couler ou flotter, les deux sont normaux.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Observer : les zones claires (hautes lumi\u00e8res) vont <strong>blanchir progressivement<\/strong> en quelques secondes. Le bleu intensifie.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\">Rincer en <strong>eau courante froide pendant 5 \u00e0 10 minutes<\/strong> \u2014 retourner d\u00e9licatement la feuille pour rincer les deux faces.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">Optionnel mais recommand\u00e9 : ajouter <strong>quelques gouttes d’eau oxyg\u00e9n\u00e9e \u00e0 3%<\/strong> dans le bain final. Le bleu gagne imm\u00e9diatement en saturation \u2014 cette \u00e9tape remplace l’oxydation naturelle qui prend 24h \u00e0 l’air.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">5<\/div>\n <div class=\"stxt\">Rin\u00e7age final \u00e0 l’eau claire. Sortir d\u00e9licatement la feuille en la soutenant \u00e0 plat.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Le bleu semble trop clair \u00e0 la sortie du bain<\/strong> \u2014 c’est normal. Le cyanotype humide est toujours plus p\u00e2le qu’une fois sec. Le bleu de Prusse continue \u00e0 s’oxyder pendant les 24 \u00e0 48 heures suivantes et prend sa teinte d\u00e9finitive, plus profonde.<\/div>\n\n <div class=\"slabel\">Probl\u00e8mes fr\u00e9quents au rin\u00e7age<\/div>\n <div class=\"checks\">\n <div class=\"chk\">\n <div class=\"cico ko\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"2\" x2=\"10\" y2=\"10\"\/><line x1=\"10\" y1=\"2\" x2=\"2\" y2=\"10\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Le bleu part enti\u00e8rement<\/strong> \u2014 sous-exposition s\u00e9v\u00e8re ou solution trop vieille. V\u00e9rifier la date de pr\u00e9paration des solutions et doubler le temps d’exposition.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ko\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"2\" x2=\"10\" y2=\"10\"\/><line x1=\"10\" y1=\"2\" x2=\"2\" y2=\"10\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Les blancs restent jaun\u00e2tres<\/strong> \u2014 rin\u00e7age insuffisant. Prolonger le bain de 5 minutes suppl\u00e9mentaires en eau froide courante.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ko\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"2\" x2=\"10\" y2=\"10\"\/><line x1=\"10\" y1=\"2\" x2=\"2\" y2=\"10\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Des taches blanches dans les zones bleues<\/strong> \u2014 bulles d’air ou poussi\u00e8res sous le n\u00e9gatif pendant l’exposition. Nettoyer la vitre et le n\u00e9gatif avant le prochain tirage.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ko\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"2\" x2=\"10\" y2=\"10\"\/><line x1=\"10\" y1=\"2\" x2=\"2\" y2=\"10\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Contours flous<\/strong> \u2014 contact insuffisant entre le n\u00e9gatif et le papier. Augmenter la pression sur la vitre ou utiliser un verre plus \u00e9pais.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"danger\"><strong>Ne pas utiliser d’eau chaude pour d\u00e9velopper.<\/strong> La chaleur dissolut \u00e9galement le bleu de Prusse fra\u00eechement form\u00e9 et d\u00e9truit l’image. L’eau doit rester inf\u00e9rieure \u00e0 20\u00b0C.<\/div>\n <\/div>\n <\/div>\n\n <!-- \u00a75 S\u00e9chage & finition -->\n <div class=\"sec\" id=\"s4\">\n <button class=\"sec-trigger\" onclick=\"toggle('s4')\">\n <span class=\"sec-num\">5<\/span>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">S\u00e9chage & finition<\/span>\n <span class=\"sec-sub\">Stabiliser, s\u00e9cher \u00e0 plat, p\u00e9renniser le tirage<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">Le s\u00e9chage est la derni\u00e8re \u00e9tape active du cyanotype. C’est pendant ces premi\u00e8res heures que le bleu de Prusse termine son oxydation et atteint sa teinte d\u00e9finitive. Un s\u00e9chage bien conduit \u00e9vite les d\u00e9formations du papier et les variations de teinte in\u00e9gales.<\/p>\n\n <div class=\"slabel\">S\u00e9chage \u00e0 plat<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">\u00c9ponger d\u00e9licatement l’exc\u00e8s d’eau sur les bords avec un essuie-tout pli\u00e9. <strong>Ne pas frotter la surface.<\/strong><\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Poser <strong>\u00e0 plat sur une surface non absorbante<\/strong> (plastique, verre, planche) ou fixer avec des pinces \u00e0 un fil horizontal en maintenant la feuille par les bords hors image.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\">S\u00e9cher \u00e0 l’air libre \u00e0 temp\u00e9rature ambiante. <strong>\u00c9viter le s\u00e8che-cheveux<\/strong> \u2014 la chaleur localis\u00e9e cr\u00e9e des zones de teinte in\u00e9gale.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">Dur\u00e9e : <strong>30 minutes \u00e0 2 heures<\/strong> selon l’humidit\u00e9 ambiante. Le papier aquarelle \u00e9pais peut prendre plus longtemps.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Le bleu continue de m\u00fbrir.<\/strong> \u00c0 la sortie du bain, le tirage peut sembler l\u00e9g\u00e8rement p\u00e2le ou l\u00e9g\u00e8rement verd\u00e2tre. Dans les 12 \u00e0 48 heures, l’oxydation atmosph\u00e9rique assombrit et bleutit progressivement le bleu de Prusse jusqu’\u00e0 sa teinte d\u00e9finitive. Ne pas juger le r\u00e9sultat final avant s\u00e9chage complet.<\/div>\n\n <div class=\"sep\"><\/div>\n\n <div class=\"slabel\">P\u00e9rennit\u00e9 & conservation<\/div>\n <div class=\"checks\">\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Conserver \u00e0 l’abri de la lumi\u00e8re directe<\/strong> \u2014 le cyanotype r\u00e9siste bien \u00e0 la lumi\u00e8re ambiante diffuse, mais un ensoleillement prolong\u00e9 d\u00e9grade les bleus sur le long terme. \u00c9viter les espaces tr\u00e8s lumineux.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>\u00c9viter le contact avec les milieux alcalins<\/strong> \u2014 certains papiers de conservation (pH basique) peuvent jaunir le bleu de Prusse par contact prolong\u00e9. Pr\u00e9f\u00e9rer des pochettes en polyester ou des interfoliaires neutres.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Le cyanotype est r\u00e9versible<\/strong> \u2014 une exposition prolong\u00e9e \u00e0 la lumi\u00e8re d\u00e9grade le bleu, mais une remise en obscurit\u00e9 pendant quelques semaines peut en partie le restaurer. Ce ph\u00e9nom\u00e8ne s’appelle la <em>r\u00e9version<\/em>.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ko\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"2\" x2=\"10\" y2=\"10\"\/><line x1=\"10\" y1=\"2\" x2=\"2\" y2=\"10\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>\u00c9viter le verre anti-UV pour l’encadrement<\/strong> \u2014 paradoxalement, il acc\u00e9l\u00e8re la d\u00e9coloration des tirages encadr\u00e9s en cr\u00e9ant un environnement l\u00e9g\u00e8rement alcalin. Pr\u00e9f\u00e9rer un verre neutre avec un espace d’air entre le tirage et le verre.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">R\u00e9sultats selon le support<\/div>\n <div class=\"result-card\">\n <div class=\"result-head\">Teinte finale selon le papier<\/div>\n <div class=\"result-row\">\n <span class=\"result-swatch\" style=\"background:#0f2a55\"><\/span>\n <div><div class=\"result-label\">Papier coton (Arches, Fabriano)<\/div><div class=\"result-desc\">Bleu de Prusse profond et satur\u00e9 \u2014 teinte de r\u00e9f\u00e9rence du cyanotype classique<\/div><\/div>\n <\/div>\n <div class=\"result-row\">\n <span class=\"result-swatch\" style=\"background:#4a5a6a\"><\/span>\n <div><div class=\"result-label\">Papier japonais (Kozo, Mulberry)<\/div><div class=\"result-desc\">Bleu-gris plus doux \u2014 le pigment p\u00e9n\u00e8tre en profondeur dans les fibres poreuses<\/div><\/div>\n <\/div>\n <div class=\"result-row\">\n <span class=\"result-swatch\" style=\"background:#2a4a60\"><\/span>\n <div><div class=\"result-label\">Tissu coton ou lin<\/div><div class=\"result-desc\">Bleu diffus et textur\u00e9 \u2014 le pigment se d\u00e9pose sur les reliefs des fibres<\/div><\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Bain d’acide citrique final (optionnel) :<\/strong> diluer 5 g d’acide citrique dans 1 litre d’eau froide et immerger le tirage 2 minutes apr\u00e8s le rin\u00e7age principal. Ce bain stabilise les blancs, \u00e9vite le jaunissement \u00e0 long terme et donne au bleu un surcro\u00eet de puret\u00e9 visible \u00e0 l’\u0153il.<\/div>\n <\/div>\n <\/div>\n\n <\/div><!-- \/sections -->\n\n <!-- \u2500\u2500 Footer \u2500\u2500 -->\n <div class=\"cy-footer\">\n <span class=\"fbadge green\">Proc\u00e9d\u00e9 non toxique<\/span>\n <span class=\"fbadge\">D\u00e9veloppement \u00e0 l’eau<\/span>\n <span class=\"fbadge\">Invent\u00e9 en 1842<\/span>\n <span class=\"fbadge\">Grand d\u00e9butant<\/span>\n <\/div>\n\n<\/div>\n\n<script>\nfunction toggle(id) {\n document.getElementById(id).classList.toggle('open');\n}\nfunction openSec(id) {\n var s = document.getElementById(id);\n if (!s.classList.contains('open')) s.classList.add('open');\n s.scrollIntoView({ behavior: 'smooth', block: 'start' });\n}\n<\/script>\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>R\u00e9aliser un cyanotype Proc\u00e9d\u00e9 alternatif \u2014 Tutoriel R\u00e9aliser son premier cyanotype De la sensibilisation du papier au tirage final \u2014 guide pas \u00e0 pas pour grands d\u00e9butants 5 \u00e9tapes D\u00e9butant UV naturels ou artificiels Faible co\u00fbt Le principe : le cyanotype est l’un des proc\u00e9d\u00e9s photographiques les plus anciens et les plus accessibles. Il repose…<\/p>\n","protected":false},"author":1,"featured_media":4903,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"narrow","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[150],"tags":[147],"class_list":["post-4877","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-procedes-photographiques-anciens","tag-cyanotype"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>R\u00e9aliser un cyanotype - NICOLAS LOUIS<\/title>\n<meta name=\"description\" content=\"Apprenez \u00e0 r\u00e9aliser votre premier cyanotype gr\u00e2ce \u00e0 ce guide complet pour d\u00e9butants. 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