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potassium ferrocyanide[pə′tas·ē·əm ‚fer·ō′sī·ə‚nīd]
potassium hexacyanoferro-ate, K4[Fe(CN)6]⋅3H2O, a complex iron (II) compound; light yellow crystals that remain stable in air. Density, 1.85 g/cm3.
Potassium ferrocyanide was first obtained by heating horns, hooves, and blood with K2C03 and iron filings. It is used as a reagent for Fe3+ ions, with which it forms the blue precipitate Prussian blue, Fe 4[[Fe(CN)6].3. Potassium ferrocyanide is also of use in other branches of analytical chemistry. In industry it is used in the manufacture of paints, K3[Fe(CN)6].