Cyanide, also known as prussic acid, chemical-type HCN. The standard state is liquid, virulent and lethal, colorless and bitter, and has a faint almond odor (bitter almond has bitter almond, hydrolysis will release hydrogen cyanide), can sniff out depending on the individual gene. Cyanide is a weak acid, boiling point 26 ℃ (79°f). Cyanide is a linear molecule, with three bonds between carbon and nitrogen.