It is used by Experienced entomologists to be a killing agent in amassing jars, as insects succumb within seconds on the HCN fumes it emits, therefore reducing harm to even very fragile specimens. KCN is made by treating hydrogen cyanide with an aqueous solution of potassium hydroxide, accompanied by evaporation https://potassium-cyanide-acidic69246.blogoxo.com/30547072/potassium-cyanide-in-drinks-an-overview