SINCE 1828
potassium ferrocyanide
nounDefinition of potassium ferrocyanide
: a tough yellow crystalline salt K4Fe(CN)6 made from the cyanogen compounds obtained as by-products in the carbonization of coal or directly by reaction of potassium cyanide with ferrous salts and used chiefly in making iron blue pigments
— called also yellow prussiate of potash
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