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Green Foil

Pale shellac, dis- Moisten recently precipitated and well washed solved in alcohol (lacquer), and tinged green hydrate of alumina, with a few drops of neu- by dissolving verdigris or acetate of copper in tral chromate of potassa, and kneaded so that it. Or: Sesquiferrocyanuret of iron and the mass assumes a scarcely perceptible tinge; bichromate of potassa, of each ounce; grind then roll it out into small sticks, about the them with a stone and muller to a fine powder, thickness of a finger, and dry them slowly, add gum mastich (clean and also in fine powfilling up any cracks that may occur in drying der), 2 ounces; grind again, add a little pywith fresh hydrate of alumina. When per- roxilic spirit, and again grind until the mass fectly dry, warm a stick a little, and bring a becomes homogeneous and of a fine transpaportion into the end of the flame of a com- rent green; the beauty increases with the pound (oxyhydrogen) blow-pipe. In a few length of the grinding. The predominance of minutes several minute balls form, of such in- the bichromate turns it on the yellowish tense hardness as to scratch quartz, glass, and green; that of the salt of iron, on the bluish granite. These, however, when cut and pol-green. For use it is to be thinned with ished, appear slightly opaque. pyroxilic spirit. This is used for emeralds.

It may be brightened by adding a little yellow varnish.