What is potassium cyanide?

Its relative molecular weight is 358. 15. This is a highly toxic substance. Properties of gold and potassium cyanide: pure gold reacts with aqua regia, after filtration and concentration, concentrated hydrochloric acid is added to remove nitrogen oxides, and then reacts with potassium cyanide, and then the finished product is obtained by crystallization. Colorless or yellowish crystal. Toxic. Soluble in water, slightly soluble in alcohol, almost insoluble in ether. The purpose is the same as chloroauric acid.