An extremely poisonous white compound, KCN, used in the extraction of gold and silver from ores, in electroplating, and in photography, and as a fumigant and insecticide. (inorganic chemistry) The potassium salt of hydrocyanic acid, KCN; the colourless crystals are soluble in water, and it is extremely poisonous, and is used in electroplating, the extraction of gold and silver from their ores, and in photography.
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