524. Alum

Dissolve one drachm of alum in fifteen ounces of water, then add half an ounce of treacle, and one drachm of diluted sulphuric acid.

Use

as an astringent.

525. Myrrh

Add six drachms of tincture of myrrh to seven ounces of infusion of linseed, and then add one drachm of diluted sulphuric acid.

Use

as a detergent.