Rachel E. Church untitled cyanotype Cyanotype is one of the oldest photographic processes, invented by John Herschel in 1842. Its name references the Greek 鈥渃yan,鈥 meaning 鈥渄ark-blue impression鈥. The process involves coating paper with a light-sensitive combination of ferric ammonium citrate and potassium ferricyanide. Once the paper is dry, either a
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