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To Make Purple of Cassius

degree, as the oils of linseed, poppy, rape, and This is a vitrifiable pigment, which stains walnut, are called drying oils, and are used as glass and porcelain a beautiful red or purple vehicles for colors in painting. The dryhue. Its preparation is one of great nicety, ing property of oils is greatly increased ly and is liable to fail even in the most experi- boiling them, either alone or with litharge, enced hands. Mix together separate solutions sugar of lead, etc., when the product fornis of 1 part crystallized protochloride of tin, and the boiled oil or drying oil of commerce. The 2 parts crystallized perchloride of tin; this litharge and sulphate of lead employed for mixture, added to a solution of 1 part crystal- this purpose, may be again used, after washing lized chloride of gold, makes a beautiful pur- them in hot water, to remove adhering muciple colored precipitate, which should imme- lage. When paints are mixed with raw cil, diately be washed, filtered, and dried. An as is frequently the case in house painting, the excess of the protochloride produces a blue, drying quality is obtained by the addition of yellow, or greenish tinge; the perchloride in compositions called dryers. These are generexcess gives a red or violet cast.