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The video tutorial focuses on the specialized use of Prussian blue pigment in the cyanotype process, where the pigment is formed directly on paper for making blueprints. The most common formulation involves potassium ferrocyanide and ferric ammonium citrate. The ferrocyanide is typically purchased, while the citrate can be made from ferric chloride. The creator struggled to find a proper procedure for the citrate but eventually succeeded with a modified 1950s method, which worked effectively. The video includes a link to the materials used.