{"id":2837,"date":"2021-05-02T18:00:00","date_gmt":"2021-05-02T16:00:00","guid":{"rendered":"https:\/\/michalhejna.cz\/blog\/?p=2837"},"modified":"2021-05-10T18:28:15","modified_gmt":"2021-05-10T16:28:15","slug":"cyanotype-part-two-kyanotypie-cast-druha","status":"publish","type":"post","link":"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/","title":{"rendered":"Cyanotype \u2013 part Two \/ Kyanotypie \u2013 \u010d\u00e1st druh\u00e1"},"content":{"rendered":"\n

Today I will tell you how to prepare a negative, how to find out the right exposure time and how to wash and stabilize the image.<\/em><\/p>\n\n\n\n

The cyanotype process cannot handle the tonal range we are used to seeing in today’s classic ways of printing or viewing photos on a computer monitor or mobile phone. The exposure of the test calibration table with graduated gray areas showed that details were not drawn in approximately 25-30% of the white and 15-20% of the black parts of the image. It is necessary to think about it when we prepare a negative. It is advisable to flatten the histogram. So that it does not cover its left and right area.<\/p>\n\n\n\n

I set a baseline exposure time of 18 minutes. Depending on the density of the negative and the intended tonality, the actual times are somewhere between 16 and 20 minutes. This is also due to the power of the 400W bulb and the distance of the source from the paper with the negative.<\/p>\n\n\n\n

I wash the cyanotype in water at a normal temperature of around 20 \u00b0 C. It usually takes about 30 to 40 minutes. The time depends mainly on the type of paper used and the speed of water movement around the sensitive layer. I use 2 baths for washing. The first bath, in addition to water, contains a small amount of citric acid. This adjusts the pH of the water for the initial rapid washing away of blue residues of ferric salts. It is advisable to wash for at least 10-15 minutes. The second bath contains a few drops of hydrogen peroxide. This supports the process of good paper stabilization.<\/p>\n\n\n\n

Finished cyanotypes can be dried on a clothesline vertically attached to the corners by pegs or laid horizontally on a suitable mat.<\/p>\n\n\n\n

Next time we go to the real world around us. On a creative journey in search of suitable themes and motifs.<\/p>\n\n\n\n

\"\"<\/a>
Michal Hejna: Pra\u017esk\u00e9 mosty, 2010\/2021, kyanotypie<\/figcaption><\/figure><\/div>\n\n\n\n

Minule jsme si \u0159ekli, jak vybrat spr\u00e1vn\u00fd pap\u00edr a nan\u00e9st sv\u011btlocitlivou vrstvu. Dnes si uk\u00e1\u017eeme, jak p\u0159ipravit digit\u00e1ln\u00ed cestou negativ. Pod\u00edv\u00e1me se tak\u00e9 na mo\u017enost rychl\u00e9ho nalezen\u00ed spr\u00e1vn\u00e9 doby osvitu pro zam\u00fd\u0161lenou tonalitu obrazu. Nakonec obraz ust\u00e1l\u00edme a vypereme tak, aby n\u00e1m kyanotypie dlouho vydr\u017eela. Tak poj\u010fme na to.<\/em><\/p>\n\n\n\n

P\u0159\u00edprava negativu<\/h2>\n\n\n\n

Proces kyanotypie nezvl\u00e1dne takov\u00fd ton\u00e1ln\u00ed rozsah, na jak\u00fd jsme zvykl\u00ed p\u0159i dne\u0161n\u00edch klasick\u00fdch zp\u016fsobech tisku nebo prohl\u00ed\u017een\u00ed fotografi\u00ed na monitoru po\u010d\u00edta\u010de \u010di mobiln\u00edho telefonu.<\/p>\n\n\n\n

Z osvitu testovac\u00ed kalibra\u010dn\u00ed tabulky s odstup\u0148ovan\u00fdmi \u0161ed\u00fdmi plochami vyplynulo, \u017ee na zhotoven\u00fdch kyanotypi\u00edch se nevykresl\u00ed detaily zhruba ve 25-30% b\u00edl\u00fdch a 15-20% \u010dern\u00fdch \u010d\u00e1stech obrazu. Z\u00e1le\u017e\u00ed samoz\u0159ejm\u011b na zvolen\u00e9m postupu, tak\u017ee toto tvrzen\u00ed plat\u00ed pouze pro m\u016fj zp\u016fsob nat\u00edr\u00e1n\u00ed chemie, pou\u017eit\u00fd pap\u00edr a vlnovou d\u00e9lku zdroje UV z\u00e1\u0159en\u00ed.<\/p>\n\n\n\n

\"\"<\/a>
P\u0159\u00edprava negativu \u2013 zplo\u0161t\u011bn\u00ed histogramu<\/figcaption><\/figure><\/div>\n\n\n\n

Jin\u00fdmi slovy to znamen\u00e1, \u017ee jsem schopen reprodukovat pouze n\u011bco m\u00e1lo p\u0159es polovinu v\u0161ech 255 polot\u00f3n\u016f mezi \u010dernou a b\u00edlou. S t\u00edm je nutn\u00e9 po\u010d\u00edtat ji\u017e p\u0159i p\u0159\u00edprav\u011b negativu. P\u0159ed tiskem na transparentn\u00ed f\u00f3lii na inkoustov\u00e9 tisk\u00e1rn\u011b je vhodn\u00e9 zplo\u0161tit histogram tak, aby nezasahoval do krajn\u00edch oblast\u00ed, jak je nazna\u010deno na horn\u00edm obr\u00e1zku.<\/p>\n\n\n\n

Sv\u00edcen\u00ed<\/h2>\n\n\n\n

P\u0159i kyanotypii se v\u017edy jedn\u00e1 o kontaktn\u00ed kopii negativu, kter\u00fd je polo\u017een na pap\u00edru s p\u0159edem p\u0159ipravenou sv\u011btlocitlivou vrstvou. Aby nedo\u0161lo k posunu b\u011bhem expozice a z\u00e1rove\u0148 byl negativ pevn\u011b p\u0159itisknut k pap\u00edru po cel\u00e9 plo\u0161e, vkl\u00e1d\u00e1m oboje do klasick\u00e9ho fotografick\u00e9ho clip r\u00e1mu. Vlastn\u00ed sv\u00edcen\u00ed pak prov\u00e1d\u00edm lampou s jednou speci\u00e1ln\u00ed UV \u017e\u00e1rovkou.<\/p>\n\n\n\n

\"\"<\/a>
Kalibra\u010dn\u00ed tabulka \u2013 pot\u0159ebn\u00fd expozi\u010dn\u00ed \u010das mezi 16 a\u017e 20 minutami<\/figcaption><\/figure><\/div>\n\n\n\n

Osvitem kalibra\u010dn\u00ed tabulky jsem krom\u011b rozsahu reprodukovan\u00fdch polot\u00f3n\u016f tak\u00e9 na\u0161el pot\u0159ebn\u00fd expozi\u010dn\u00ed \u010das. Jako z\u00e1klad jsem zvolil 18 minut. Podle hustoty konkr\u00e9tn\u00edho negativu a zam\u00fd\u0161len\u00e9 tonality pak \u010dasy vych\u00e1zej\u00ed n\u011bkde mezi 16 a\u017e 20 minutami. Je to d\u00e1no i v\u00fdkonem \u017e\u00e1rovky 400W a vzd\u00e1lenost\u00ed zdroje od pap\u00edru s negativem, kter\u00e1 je asi 80 centimetr\u016f vzhledem k nutnosti osv\u00edtit plochu velikosti A4.<\/p>\n\n\n\n

Studiem dostupn\u00fdch materi\u00e1l\u016f jsem zjistil, \u017ee mnoho autor\u016f nepou\u017e\u00edv\u00e1 klasick\u00fd \u010dernob\u00edl\u00fd negativ, ale p\u0159ed tiskem na tisk\u00e1rn\u011b negativ zabarvuj\u00ed do r\u016fzn\u00fdch odst\u00edn\u016f. Nej\u010dast\u011bji do oran\u017eova. Vyzkou\u0161el jsem to tak\u00e9 v lev\u00e9 \u010d\u00e1sti exponovan\u00e9 kalibra\u010dn\u00ed tabulky na horn\u00edm obr\u00e1zku. Ale p\u0159i\u0161lo mi, \u017ee v\u00fdsledek nen\u00ed ni\u010d\u00edm p\u0159esv\u011bd\u010div\u00fd, \u017ee by to m\u011blo z\u00e1sadn\u00edm zp\u016fsobem ovlivnit v\u00fdslednou tonalitu. Tak\u017ee d\u00e1l tisknu negativy „black and white“.<\/p>\n\n\n\n

Vyp\u00edr\u00e1n\u00ed<\/h2>\n\n\n\n

Kyanotypie vyp\u00edr\u00e1m ve vod\u011b p\u0159i norm\u00e1ln\u00ed teplot\u011b kolem 20\u00b0C. Obvykle to trv\u00e1 p\u0159ibli\u017en\u011b 30 a\u017e 40 minut. Doba je z\u00e1visl\u00e1 p\u0159edev\u0161\u00edm na druhu pou\u017eit\u00e9ho pap\u00edru a rychlosti pohybu vody kolem citliv\u00e9 vstvy. Je nutn\u00e9, aby pou\u017eit\u00e1 voda stejn\u011b jako pap\u00edr nebyla p\u0159\u00edli\u0161 alkalick\u00e1. Proto pou\u017e\u00edv\u00e1m pro vyp\u00edr\u00e1n\u00ed 2 l\u00e1zn\u011b.<\/p>\n\n\n\n

Prvn\u00ed l\u00e1ze\u0148 krom\u011b vody obsahuje mal\u00e9 mno\u017estv\u00ed rozpu\u0161t\u011bn\u00e9ho pr\u00e1\u0161ku kyseliny citr\u00f3nov\u00e9, kter\u00e1 vhodn\u00fdm zp\u016fsobem uprav\u00ed pH vody pro po\u010d\u00e1te\u010dn\u00ed rychl\u00e9 odplavov\u00e1n\u00ed modr\u00fdch zbytk\u016f \u017eelezit\u00fdch sol\u00ed. V t\u00e9to l\u00e1zni je vhodn\u00e9 vyp\u00edrat alespo\u0148 10-15 minut.<\/p>\n\n\n\n

Druh\u00e1 l\u00e1ze\u0148 pak obsahuje p\u00e1r kapek peroxidu vod\u00edku. Ten jednak podporuje proces kvalitn\u00edho ust\u00e1len\u00ed pap\u00edru a z\u00e1rove\u0148 ve vod\u011b namo\u010den\u00fd obr\u00e1zek tonalitou re\u00e1ln\u011b odpov\u00edd\u00e1 tomu, jak bude kyanotypie vypadat po vysu\u0161en\u00ed. Dost\u00e1v\u00e1 kone\u010dnou brilanci a kontrast.<\/p>\n\n\n\n

Kyanotypii koupeme tak dlouho, a\u017e se n\u00e1m zamlouv\u00e1 jej\u00ed celkov\u00e9 vyzn\u011bn\u00ed. Postupn\u011b se vyplavuje v\u00edc a v\u00edc \u017eelezit\u00fdch sol\u00ed a obraz sv\u011btl\u00e1. M\u011bjme v\u0161ak na pam\u011bti, \u017ee a\u017e pap\u00edr uschne, tonalita bude p\u0159ece jen o n\u011bco tmav\u0161\u00ed, ne\u017e se jev\u00ed ve vod\u011b. Cel\u00fd proces ale nesm\u00edme usp\u011bchat, v\u00fdsledkem by byla nest\u00e1lost kyanotypi\u00ed v \u010dase.<\/p>\n\n\n\n

Su\u0161en\u00ed<\/h2>\n\n\n\n

Hotov\u00e9 kyanotypie m\u016f\u017eeme su\u0161it na pr\u00e1deln\u00ed \u0161\u0148\u016f\u0159e svisle uchycen\u00e9 za rohy kol\u00ed\u010dky nebo voln\u011b vodorovn\u011b polo\u017een\u00e9 na podlo\u017ece. V z\u00e1vislosti na kl\u00ed\u017een\u00ed pou\u017eit\u00e9ho akvarelov\u00e9ho pap\u00edru se n\u00e1m p\u0159i su\u0161en\u00ed pap\u00edr lehce zkrout\u00ed, proto je v\u011bt\u0161inou nutn\u00e9 po dokonal\u00e9m vyschnut\u00ed kyanotypii n\u011bjak\u00fdm vhodn\u00fdm zp\u016fsobem vyrovnat. R\u016fzn\u00e9 pap\u00edry se chovaj\u00ed r\u016fzn\u011b.<\/p>\n\n\n\n

Osobn\u011b nem\u00e1m dobrou zku\u0161enost s t\u00edm, nechat pap\u00edr Arches vyrovnat zat\u00ed\u017een\u00fd po cel\u00e9 plo\u0161e n\u011b\u010d\u00edm t\u011b\u017ek\u00fdm, nap\u0159\u00edklad knihami. Sice se v\u011bt\u0161inou celkov\u011b vyrovn\u00e1, ale okrajov\u00e9 \u010d\u00e1sti z\u016fstanou nevratn\u011b krabat\u00e9. Nejsp\u00ed\u0161 to souvis\u00ed s jeho kl\u00ed\u017een\u00edm a pom\u011brn\u011b velkou nas\u00e1kavost\u00ed, kdy p\u0159i vysou\u0161en\u00ed se jinak deformuje v oblastech nat\u0159en\u00fdch chemi\u00ed a vlh\u010den\u00fdch p\u0159i nat\u00edr\u00e1n\u00ed \u2013 na rozd\u00edl od okraj\u016f, kter\u00e9 p\u0159i p\u0159\u00edprav\u011b vlh\u010deny nejsou. Tak\u017ee kyanotypie su\u0161\u00edm voln\u011b polo\u017een\u00e9 na podlaze.<\/p>\n\n\n\n

\"\"
Z\u00e1b\u011br z jedn\u00e9 z prvn\u00edch kyanotypick\u00fdch seanc\u00ed tv\u016fr\u010d\u00edho sdru\u017een\u00ed \u010cern\u00e1 slune\u010dnice.<\/figcaption><\/figure><\/div>\n\n\n\n
\n\n\n\n


Tak a pro dne\u0161ek m\u00e1me hotovo. V ruce dr\u017e\u00edme svoji prvn\u00ed fotografii vytvo\u0159enou starod\u00e1vnou technikou. Origin\u00e1l, kter\u00e9mu se m\u00e1lo co vyrovn\u00e1.<\/p>\n\n\n\n

A nebojte. P\u0159\u00ed\u0161t\u011b ji\u017e opust\u00edme mo\u017en\u00e1 m\u00edsty nudnou techniku a vyd\u00e1me se do re\u00e1ln\u00e9ho sv\u011bta kolem n\u00e1s. Na tv\u016fr\u010d\u00ed cestu hled\u00e1n\u00ed vhodn\u00fdch n\u00e1m\u011bt\u016f a motiv\u016f.<\/p>\n\n\n\n

Douf\u00e1m, \u017ee se v\u00e1m dne\u0161n\u00ed pov\u00edd\u00e1n\u00ed l\u00edbilo. Jak\u00e9 vy byste o\u010dek\u00e1vali n\u00e1m\u011bty pro kyanotypick\u00e9 modrotisky? V diskuzi pod \u010dl\u00e1nkem m\u016f\u017eete tipovat nebo vyslovit sv\u00e9 p\u0159\u00e1n\u00ed…<\/p>\n","protected":false},"excerpt":{"rendered":"

Today I will tell you how to prepare a negative, how to find out the right exposure time and how to wash and stabilize the image …<\/p>\n","protected":false},"author":1,"featured_media":2840,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[21],"tags":[43],"class_list":["post-2837","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-story","tag-cyanotype"],"yoast_head":"\nCyanotype \u2013 part Two \/ Kyanotypie \u2013 \u010d\u00e1st druh\u00e1 - Michal Hejna<\/title>\n<meta name=\"description\" content=\"Dnes si uk\u00e1\u017eeme, jak p\u0159ipravit negativ pro kyanotypii, jak nal\u00e9zt spr\u00e1vnou dobu a jak obraz vyprat a ust\u00e1lit, aby n\u00e1m kyanotypie dlouho vydr\u017eela.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kyanotypie \u2013 d\u00edl druh\u00fd\" \/>\n<meta property=\"og:description\" content=\"Dnes si uk\u00e1\u017eeme, jak p\u0159ipravit negativ pro kyanotypii, jak nal\u00e9zt spr\u00e1vnou dobu a jak obraz vyprat a ust\u00e1lit, aby n\u00e1m kyanotypie dlouho vydr\u017eela.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/\" \/>\n<meta property=\"og:site_name\" content=\"Michal Hejna\" \/>\n<meta property=\"article:published_time\" content=\"2021-05-02T16:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-05-10T16:28:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/michalhejna.cz\/blog\/wp-content\/uploads\/2021\/04\/cyanotype_prazske-mosty_web.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"1120\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"michalhejna\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Napsal(a)\" \/>\n\t<meta name=\"twitter:data1\" content=\"michalhejna\" \/>\n\t<meta name=\"twitter:label2\" content=\"Odhadovan\u00e1 doba \u010dten\u00ed\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minut\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/\"},\"author\":{\"name\":\"michalhejna\",\"@id\":\"https:\/\/michalhejna.cz\/blog\/#\/schema\/person\/6d1d95e2413952dd3b1ce433f4d3013c\"},\"headline\":\"Cyanotype \u2013 part Two \/ Kyanotypie \u2013 \u010d\u00e1st druh\u00e1\",\"datePublished\":\"2021-05-02T16:00:00+00:00\",\"dateModified\":\"2021-05-10T16:28:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/\"},\"wordCount\":1378,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/michalhejna.cz\/blog\/#\/schema\/person\/6d1d95e2413952dd3b1ce433f4d3013c\"},\"image\":{\"@id\":\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/i0.wp.com\/michalhejna.cz\/blog\/wp-content\/uploads\/2021\/04\/cyanotype_prazske-mosty_web.jpg?fit=1600%2C1120&ssl=1\",\"keywords\":[\"cyanotype\"],\"articleSection\":[\"Story \/ P\u0159\u00edb\u011bh\"],\"inLanguage\":\"cs\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/\",\"url\":\"https:\/\/michalhejna.cz\/blog\/2021\/05\/02\/cyanotype-part-two-kyanotypie-cast-druha\/\",\"name\":\"Cyanotype \u2013 part Two \/ Kyanotypie \u2013 \u010d\u00e1st druh\u00e1 - 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