To 10 lbs. flint glass, previously melted and cast into water, add zaffer, (6 drs., ½ oz. of calcined copper, prepared by putting sheet copper into a crucible, and exposing it to the action of a fire not strong enough to melt the copper, and you will have the copper in scales, which you pound.

Bright Purple

Use 10 lbs. flint glass as before; zaffer, 5 drs.; precipitate of calcium, 1 dr.

Gold Yellow

Twenty-eight pounds flint glass, and a quarter pound of the tartar which is found in urine, purify by potting it In a crucible in the fire till it smoke no more; add 2 oz. of manganese.