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The video tutorial explores the use of Prussian blue pigment in a process called cyanotype, in which the pigment is formed directly on paper. The process traditionally involved potassium ferrocyanide and ferric ammonium citrate. The creator bought the ferrocyanide but made the ferric ammonium citrate from ferric chloride. Though finding a suitable procedure was difficult, the altered 1950s method worked well. A link to the video is included.