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The video tutorial explores the specialized use of Prussian blue pigment in cyanotype photography. Prussian blue is formed directly on paper in this process, traditionally used for blueprints. The most popular cyanotype formulation uses potassium ferrocyanide and ferric ammonium citrate. The ferrocyanide is difficult to make safely, so it's bought online. Ferric ammonium citrate can be made from ferric chloride. The creator modified a 1950s procedure and found success. They provide a link for more information.