Cyanotype

Cyanotype is a photographic printing process, which produces prints that are blue. John Herschel discovered the process in 1842. Engineers used the process well

Cyanotype
Cyanotypie, Dictyota dichotoma, by Anna Atkins
Sir John F.W. Herschel: Lady with a harp, 1842
Cyanotype photogram on linen by Kate Cordsen. 2016 at Florence Griswold Museum

Cyanotype is a photographic printing process, which produces prints that are blue. John Herschel discovered the process in 1842. Engineers used the process well into the 20th century as a simple and low-cost process to produce copies of drawings, referred to as blueprints. The process uses two chemicals: ammonium iron(III) citrate and potassium ferricyanide.

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