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Fine White Enamel

Washed diaphoretic antimony, 1 part; fine glass (perfectly free ceed as before. fectly free from lead), 3 parts; mix, and pro- 2398. To Make Black Enamel for Gold or Silver. Melt together in a crucible, 1 part, by weight, of silver, 5 parts copper, 7 parts lead, and 5 parts muriate of ammonia.

Add to this mixture twice its quantity of pulverized sulphur , covering the crucible immediately.

Let it calcine until the excess of sulphur has passed off. Then pound the compound to coarse powder and make it into a paste with a solution of muriate of ammonia.

This is the black enamel used for jewelry. of tin. Thus prepared, the pots are gradually carbonate of sodium, borax, and a little oxide dried and then the glaze is fired or fused under a mufile at a bright red heat. Oxide of lead, impairs its efficiency, as it will not resist the although increasing the fusibility of the glaze, action of acids in cooking. lazes. Glazes must be reduced to ground with water to a very thin paste cr a very fine powder. For use they are smooth cream, into which the articles, previously baked to the state called "biscuit," 2399. To Black Enamel Gold or Sil- are then dropped; they are afterwards exposed ver. Place some of the enamel paste, as pre- to a sufficient heat in the kiln to fuse the pared in the preceding receipt, on the article glaze. Another method of applying them is to be enameled; hold it over a spirit lamp to immerse the biscuit in water for a minute until the enamel melts and flows upon it. It or so, and then to sprinkle the dry powder may then be smoothed and polished. over the moistened surface.

ARTIFICIAL GEMS.