It has a fine yellow color, and was formerly much used in making buttons and pressed articles resembling gold. Later alloys, however, surpass it in color, and it has fallen somewhat into disuse. One variety of Mannheim gold, so called, contains 1.40 parts of brass (composition 3 Cu2 1 Zn) to 10 of copper and 0.1 of zinc.
Mosaic Gold.
Oreïde Or Oroïde (French Gold).
| I | II | III | |
|---|---|---|---|
| Copper | 90 | 80.5 | 86.21 |
| Zinc | 10 | 14.5 | 31.52 |
| Tin | — | — | 0.48 |
| Iron | — | — | 0.24 |
A special receipt for oreïde is the following:
IV.—Melt 100 parts of copper and add, with constant stirring, 6 parts of magnesia, 3.6 of sal ammoniac, 1.8 of lime, and 9 of crude tartar. Stir again {69} thoroughly, and add 17 parts of granulated zinc, and after mixing it with the copper by vigorous stirring keep the alloy liquid for one hour. Then carefully remove the scum and pour off the alloy.
Pinchbeck.
| Copper | 88.8 | 93.6 |
| Zinc | 11.2 | 6.4 |
| Or | ||
| Copper | 2.1 | 1.28 |
| Zinc | — | 0.7 |
| Brass | 1.0 | 0.7 |