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Contact SupplierOffer potassium cyanide. An extremely poisonous white compound, kcn, used in the extraction of gold and silver from ores, in electroplating, andin photography, and as a fumigant and insecticide. (inorganic chemistry) the potassium salt ofhydrocyanic acid, kcn; thecolourless crystals are solublein water, and it is extreme lypoisonous, and is used inelectroplating, the extraction of gold and silver from their ores,and in photography.