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Contact SupplierOffer potassium cyanide. An extremely poisonous white compound, kcn, used in theextraction of gold and silverfrom ores, in electroplating, andin photography, and as a fumigantand insecticide. (inorganicchemistry) the potassium salt ofhydrocyanic acid, kcn; thecolourless crystals are solublein water, and it is extremelypoisonous, and is used inelectroplating, the extraction ofgold and silver from their ores,and in photography.