Characters. - A heavy white powder in minute crystalline scales, blackened by sulphuretted hydrogen.

Solubility. - Insoluble in water, but soluble in nitric acid mixed with half its volume of distilled water.

Reactions. - The solution in nitric acid when poured into water gives a white precipitate. It forms with sulphuric acid diluted with an equal bulk of water a solution which is blackened by sulphate of iron (nitrate). The nitric acid solution gives no precipitate with diluted sulphuric acid (no lead) nor with solution of nitrate of silver (no chloride).

Impurities. - Lead, nitrates, chlorides.

Dose. - 5 to 20 grains.

Preparation

B.P.

Dose.

Trochisci Bismuthi, 2 grs. in each lozenge ...............................

1 to 6 lozenges.

Bismuthi Carbonas, B.P.; Bismuthi Subcarbonas, U.S.P.