{"id":1198,"date":"2022-01-06T18:21:16","date_gmt":"2022-01-06T17:21:16","guid":{"rendered":"https:\/\/agnesl.fr\/meditation\/?p=1198"},"modified":"2022-01-21T14:34:08","modified_gmt":"2022-01-21T13:34:08","slug":"procede-cyanotype","status":"publish","type":"post","link":"https:\/\/agnesl.fr\/meditation\/procede-cyanotype\/","title":{"rendered":"Cyanotypie ou proc\u00e9d\u00e9 cyanotype."},"content":{"rendered":"\n
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Le cyanotype est un proc\u00e9d\u00e9 ancien, proc\u00e9d\u00e9 photographique monochrome n\u00e9gatif, ou “par contact” par le biais duquel on obtient un tirage photographique bleu de Prusse, ou bleu cyan, d’o\u00f9 son nom. Cette technique a \u00e9t\u00e9 mise au point en 1842 par le scientifique et astronome anglais John Frederick William Herschel. Le proc\u00e9d\u00e9 utilise deux produits chimiques :
\u2022 Citrate d’ammonium ferrique (vert ou brun)
\u2022 Ferricyanure de potassium (rouge). Le citrate d\u2019ammonium ferrique (vert), sensible \u00e0 la lumi\u00e8re UV, r\u00e9duit ses ions ferriques Fe 3+ en ions ferreux Fe 2+ sous l\u2019effet des rayons UV. Ces ions ferreux Fe 2+ sont ensuite libres de r\u00e9agir avec le ferricyanure de potassium pour former du ferrocyanure ferrique plus connu sous le nom de bleu de Prusse. Ce n\u2019est donc pas une technique de photo argentique \u00e0 proprement parler, mais une technique de photo ferrique !<\/p>\n\n\n\n

Le premier livre ayant utilis\u00e9 ce proc\u00e9d\u00e9 est \u201dBritish Algae\u201d (1841-1853) de la Britannique Anna Atkins (1799-1871).\nAnna Atkins est une botaniste britannique, n\u00e9e le 16 mars 1799 \u00e0 Tonbridge dans le Kent et d\u00e9c\u00e9d\u00e9e le 9 juin 1871.\nConsid\u00e9r\u00e9e comme une pionni\u00e8re de l'utilisation d'images photographiques pour l'illustration d'ouvrages imprim\u00e9s (notamment par cyanotype), en l'occurrence les herbiers qu'elle fit para\u00eetre \u00e0 partir de 1843. Certains la consid\u00e8rent m\u00eame comme la premi\u00e8re femme \u00e0 avoir r\u00e9alis\u00e9 une photographie, titre qu'elle dispute avec Constance Talbot, l'\u00e9pouse de William Henry Fox Talbot. Elle est connue pour son herbier, qu'elle a l\u00e9gu\u00e9 au British Museum en 1865 et au Victoria and Albert Museum.<\/pre>\n\n\n\n
  • \"\"
    Algue brune Dictyota Dichotoma. <\/span><\/em><\/figcaption><\/figure><\/li>
  • \"\"
    Brins de Festuca<\/figcaption><\/figure><\/li>
  • \"\"
    Pr\u00eale des bois Equisetum Sylvaticum<\/span>.<\/figcaption><\/figure><\/li><\/ul><\/figure>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"
    Le cyanotype est un proc\u00e9d\u00e9 ancien, proc\u00e9d\u00e9 photographique monochrome n\u00e9gatif, ou “par contact” par le biais duquel on obtient un tirage photographique bleu de Prusse, ou bleu cyan, d’o\u00f9 son … <\/p>\n","protected":false},"author":1,"featured_media":1201,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_theme","format":"standard","meta":{"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"categories":[34],"tags":[],"ticketed":false,"_links":{"self":[{"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/posts\/1198"}],"collection":[{"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/comments?post=1198"}],"version-history":[{"count":5,"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/posts\/1198\/revisions"}],"predecessor-version":[{"id":1229,"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/posts\/1198\/revisions\/1229"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/media\/1201"}],"wp:attachment":[{"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/media?parent=1198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/categories?post=1198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agnesl.fr\/meditation\/wp-json\/wp\/v2\/tags?post=1198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}