A mercuric ammonium chlorid produced by the precipitation of a solution of mercuric chlorid by a solution of ammonia; it should represent not less than 78 nor more than 80 per cent, of metallic mercury.

Properties : Ammoniated mercury forms white pulverulent pieces or a white amorphous powder, having an earthy, afterward styptic and metallic taste. It is practically insoluble in water or in alcohol, but is gradually decomposed by washing with water. It is readily soluble in warm acids with decomposition. It also dissolves in cold solution of ammonium carbonate.

Ammoniated mercury is chiefly used in the form of: