ALUMEN EXSICCATUM—DRIED ALUM
Commonly termed burnt alum, is alum deprived of its water of crystallization by heat.
Properties.—A white granular powder, odorless, having a sweetish astringent taste, soluble in twenty parts of water at 60° F. Is a powerful astringent and escharotic.
ALUMINI HYDROXIDUM—ALUMINUM HYDROXIDE
Derivation.—Made from alum, 100 parts; monohydrate sodium carbonate, 43 parts; water, a sufficient quantity. Mix hot, boiling solutions of alum and sodium carbonate. Precipitate strained, washed and dried.
Properties.—A white, light, amorphous powder; odorless and tasteless; permanent in dry air; insoluble in water or alcohol.
Dose.—Same as alum.
ALUMINI SULPHAS—ALUMINUM SULPHATE
Derivation.—Aluminum hydroxide is dissolved in diluted sulphuric acid, and the solution is filtered and evaporated to dryness.
Properties.—A white, crystalline powder, without odor, having a sweetish and afterwards astringent taste; permanent in the air; soluble in one part of water; insoluble in alcohol.