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The video tutorial explores the use of Prussian blue pigment in a process called cyanotype, where the pigment is formed directly in paper to make blue prints. The most popular formulation includes potassium ferrocyanide and ferric ammonium citrate. The ferrocyanide was bought online, while the citrate was made from ferric chloride. The procedure was challenging to find, sourced from a 1950s guide with some alterations, but resulted in a successful outcome.