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Title
Picture of the crystals of the chemical substance Potassium Ferro cyanide made by a microscope in polarized light #257563909
Description
Uses of Potassium Ferrocyanide used in the tempering of steel and in process engraving. It is employed in the manufacture of pigments and as a chemical reagent. A small amount of pyro and hydroquinone developers tends to lower fog and give greater density.