Cyanotype

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C a me al essPhot ogr aphy Ca me r a r Thecy anot y pepr ocessusesami xt ur eof i r oncompounds, whi chwhenexposedt o UVl i ghtandwashedi nwat eroxi di set o cr eat ePr ussi anBl uei mages. Thepr ocessusest wochemi cal s:f er r i cammoni um ci t r at eandpot assi um f er r i cy ani de. Thet echni quewasi nvent edi n1 841bySi r J ohnHer schelandwaspopul ar i sedby phot ogr apherandbot ani stAnnaAt ki ns. Herbook‘ Phot ogr aphsofBr i t i shAl gae: Cy anot y peI mpr essi ons’ , publ i shedi n Oct ober1 843, i sconsi der edt hef i r st phot ogr aphi cal l yi l l ust r at edbook.





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