Cyanotype

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Cyanotype

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Cyanotype

Cyanotype is a photographic printing process that produces a cyan-blue print. 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 citrate and potassium ferricyanide.

Image © Robert A. Schaefer, Jr.