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In a previous video, Prussian blue pigment was created and used to color things like paint. This time, the focus is on a more specialized use in a process called cyanotype, where Prussian blue is formed directly in paper for making blue prints. The process typically involves potassium ferrocyanide and a UV-sensitive iron compound. The ferrocyanide is difficult to make safely, so it was purchased. The ferric ammonium citrate was made starting from ferric chloride. Despite challenges in finding a procedure, a 1950s method was adapted and successfully utilized. A link to the full process is provided.