Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 274
Silver, Copper, Nickel, And Zinc Alloys.
Оглавление—These alloys, from the metals contained in them, may be characterized as argentan or German silver with a certain percentage of silver. They have been used for making small coins, as in the older coins of Switzerland. Being quite hard, they have the advantage of wearing well, but soon lose their beautiful white color and take on a disagreeable shade of yellow, like poor brass. The silver contained in them can be regained only by a laborious process, which is a great drawback to their use in coinage. The composition of the Swiss fractional coins is as follows:
| 20 centimes | 10 centimes | 5 centimes | |
|---|---|---|---|
| Silver | 15 | 10 | 5 |
| Copper | 50 | 55 | 60 |
| Nickel | 25 | 25 | 25 |
| Zinc | 10 | 10 | 10 |
