Thiocarbamic acid

Thiocarbamic acid, or, more definitely, thiolthioncarbamic acid, HS-CS-NH₂, is obtained from its ammonium salt, which is formed by the combination of carbon disulphide with dry ammonia in presence of alcohol, whence the salt crystallises in prisms. Hydrochloric acid separates the acid from an aqueous solution of its ammonium salt in the form of an unstable oil which crystallises below 10° C., smells of hydrogen sulphide, is acid in reaction, and easily decomposes into H₂S and CNHS.