III.—Tin, 90 parts; copper, 3 parts; antimony, 7 parts. {80}
Zinc Alloys:
Bidery Metal.
Other compositions of Indian Bidery metal (frequently imitated in England) are about as follows:
| P.C. | P.C. | P.C. | |
|---|---|---|---|
| Copper | 3.5 | 11.4 | 16 |
| Zinc | 93.4 | 84.3 | 112 |
| Tin | — | 1.4 | 2 |
| Lead | 3.1 | 2.9 | 4 |
Erhardt recommends the following as being both ductile and hard:
| Zinc | 89 to 93 |
| Tin | 9 to 6 |
| Lead | 2 to 4 |
| Copper | 2 to 4 |
The tin is first melted, and the lead, zinc, and copper added successively.