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In a previous video, Prussian blue pigment was made and used for painting. This time, the focus is on cyanotype, where Prussian blue forms directly on paper for blue prints. The process involves potassium ferrocyanide and UV-sensitive iron compound. Buying ferrocyanide is recommended due to safety concerns. Ferric ammonium citrate can be made from ferric chloride using a procedure from the 1950s, with some adjustments. The process was successful. (309 characters)