Cyanotypes

Cyanotypes

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: ferric ammonium citrate and potassium ferricyanide.

Discover the women in photography who revolutionised the practice and the photographers keeping the practice at the cutting edge.