Use
MERCURIC OXYCYANIDE detonates on heating [Hawley]. Several instances have been reported where explosions occurred in handling this substance. Friction is a frequent cause of the explosion [Chem. Abst. 16:2010. 1972]. Decomposes on contact with acid to give off hydrogen cyanide, a flammable poisonous gas. Desensitized by mixing 67% mercuric cyanide to create commercial product.