The Works of Geber (1678)

by gentle fire. Calcine the congelate solidified substance for a day and night in a moderate fire, and keep it for use.

Cleansing of Salt-Alkali.

Salt-Alkali is cleansed in the same way as common salt, and it is Sagimen Vitri glass-gall or salt of glass. First it is ground, and then the whole is dissolved in hot common water; afterward filtered, solidified, and calcined with a moderate fire.

Cleansing of Salt-Gem.

First it is ground, and then it is proceeded with as with common salt.

Cleansing of Salarmoniac.

Grind it first with the preparation of cleansed common salt; then let it be sublimed in a high body and head an alembic, until it all ascends pure. Afterward dissolve it upon a porphyry a hard stone slab in the open air, if you would make water liquid of it; or keep the sublimate sufficiently pure.

Cleansing of other Salts:

There are various other kinds of salt found, which are prepared and cleansed as is said above.

Cleansing of Alloms.

First of rock alum: Many things may be prepared by it without its cleansing; yet it may be cleansed thus: Put it in an alem-