Cyanotype is a photographic printing process that produces blue-coloured prints using iron salts, known for its simplicity and historical significance in photography.
What is Cyanotype?
Cyanotype is a non-silver photographic printing process that creates a characteristic blue image, often referred to as a blueprint. The process was invented by Sir John Herschel in 1841 and involves the use of two primary chemicals: ferric ammonium citrate and potassium ferricyanide. When these chemicals are exposed to ultraviolet light, they undergo a photochemical reaction that results in the formation of Prussian blue, giving the prints their distinctive colour.
