22 parts gold, 2 parts copper, is 22 carats fine; 20 parts gold, and 4 parts copper, is 20 carats fine; 18 parts gold, and 6 parts copper, is 18 carats fine.

1. Red Gold

Copper, 66.67 parts; gold 33.33 parts.

2. Yellow Gold

Copper, 12.50 parts; silver, 37.50 parts; gold, 50 parts.

3 Green Gold

Silver, 25 parts; cold, 75 parts.

4. Yellow Gold

Silver, 66.67 parts; gold, 33.33, parts;

5. Gray Gold

Silver, 5.89 parts; gold, 88.23 parts; iron, 5.89 parts.

6. Dentists' Gold

Silver, 8.:54 parts; platinum, 66.67 parts; gold, 24.29 parts.

7. English Gold Coin

Copper, 8.34 parts; gold, 01.68 parts.

8. American Gold Coin

Copper, 10 parts; gold, 90 parts. French gold coin same as American.