| ozs. | dwts. | grs. | |
|---|---|---|---|
| Fine gold | 0 | 18 | 8 |
| Fine silver | 0 | 1 | 6 |
| Fine copper | 0 | 0 | 10 |
No borax must be used in the melting of this alloy, it being of a more fusible nature than the ordinary alloy, and will not take so high a heat in enameling.
II. Red Enamel.—The enamel which forms this color being of a higher fusing point, if proper care be not taken, the gold will melt first, and the work become ruined. In the preparation of red enamel, the coloring matter is usually an oxide of gold, and this so raises the temperature at which it melts that, in order to prevent any mishap, the gold to be enameled on should be what is called a 22-carat red, that is, it should contain a preponderance of copper in the alloying mixture so as to raise the fusing point of the gold. The formula is:
| ozs. | dwts. | grs. | |
|---|---|---|---|
| Fine gold | 0 | 18 | 8 |
| Fine silver | 0 | 0 | 10 |
| Fine copper | 0 | 1 | 6 |
Gold-leaf Alloys.
The following is a list of the principal classes of leaf recognized and ordinarily prepared by beaters with the proportion of alloy they contain:
| Gold grs. | Silver grs. | Copper grs. | ||
|---|---|---|---|---|
| I. | Red gold | 456–460 | — | 20–24 |
| II. | Pale red | 464 | — | 16 |
| III. | Extra deep | 456 | 12 | 12 |
| IV. | Deep | 444 | 24 | 12 |
| V. | Citron | 440 | 30 | 10 |
| VI. | Yellow | 408 | 72 | — |
| VII. | Pale yellow | 384 | 96 | — |
| VIII. | Lemon | 360 | 120 | — |
| IX. | Green or pale | 312 | 168 | — |
| X. | White | 240 | 240 | — |
Gold-plate Alloys.
II.—Gold, 84 parts; copper, 16 parts.
III.—Gold, 75 parts; copper, 25 parts.