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In a previous video, Prussian blue pigment was made and used to color paint. This time, the focus is on a specialized use in cyanotype, where Prussian blue is formed directly on paper. The process traditionally made blueprints using potassium ferrocyanide and a UV-sensitive iron compound. Ferrocyanide had to be bought, while ferric ammonium citrate was made from ferric chloride. Though finding a procedure was difficult, a 1950s one was downscaled and altered successfully. A link to the process is included.
