The Materia Medica of the Hindus, compiled from Sanskrit Medical Works c4.s3.20

c4.s3.20

द्रावक *Drávaka* or distilled mineral acids. Several formulæ are given in different works for the preparation of mineral acids. A number of mineral substances or salts are heated in a retort and the distilled fluid collected in a glass receiver. The test of acids is said to be their property of dissolving a cowrie or shell thrown into them. The following are two examples of the compositions used for preparing mineral acids.