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Gold Lustre

Dissolve 1 drachm grain-gold in ounce aqua-regia, add 6 grains metallic tin to the solution. When dissolved, . When dissolved, pour it gradually, with constant stirring, into least. Hessian crucibles are preferred for this purpose, and the heat of an ordinary porcelain kiln is usually sufficient; but a small wind-furnace, devoted exclusively to the purpose, is in general more convenient. It is . It is found that the more tranquil, continuous and uniform the fusion, the denser and clearer is the paste, and the greater its refractive powrefractive power and beauty. All the colored vitreous comvitreous compounds noticed as enamels (sce No. 2378, &c.) may be worked up in this way into ornamental stones. It may be further observed that the beauty of pastes or imitation gems, and especially the brilliancy of mock diamonds, is and the skillful arrangement of the foil or tinsel behind them. (Sec ENAMELS , No. 2378, &c.; FOILS, No. 2447, Sc.) a mixture of drachm balsam of sulphur, greatly dependent on the cutting, setting up, (sce Index), and 20 grains oil of turpentine.

When the mass begins to stiffen, an additional + drachm oil of turpentine must be added and well mixed in. More gold deepens and brightand brightens the lustre; more tin turns it on the violet or purple. Applied as in No. 2414.