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There must be in the solution no sensible excess either of iodine or more particularly of chlorine, over that required to form the monochloride.

Wijs' iodine reagent is made by dissolving 13 grammes iodine in 1 litre of glacial acetic acid and passing chlorine into the solution until the iodine is all converted into iodine monochloride.

Passing a stream of chlorine gas into a tank of melted sulfur produces sulfur monochloride and this treated with the ethylene makes the "mustard."

The new direct, sulphur monochloride method was taken up actively and several private firms attempted to develop the small scale manufacture.