Prep. Made by dissolving twenty ounces, by weight, of mercury, in twelve fluid ounces of sulphuric acid with the aid of heat; and subsequently evaporating until a dry white salt remains.

Prop. & Comp. Sulphate of mercury forms a white crystalline powder, which is decomposed by the action of water, and rendered yellow, from the formation of a subsalt of mercury 3 Hg O, So3. Sulphate of mercury is entirely volatilized by heat. Its composition is represented by the formula, Hg O, So3.

Use. It is used in the preparation of corrosive sublimate and calomel, and not given as a remedy. The yellow subsulphate above mentioned, under the name of Turbith Mineral, has been employed as an errhine.