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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(III) citrate and potassium ferricyanide.n contrast to most historical and present-day processes, cyanotype prints do not react well to basic environments. As a result, it is not advised to store or present the print in chemically buffered museum board, as this makes the image fade.
Hippolyte Bayard (1807-1887) - direct positive cyanotype images. Sir John Herschel (1792-1871) - inventor of cyanotype and discovery of sodium thiosulfate as a way to fix the photographic image. 1850s Anna Atkins (1799-1871) - âBritish Algae: Cyanotype Images, first book that was illustrated using photography.