3397. Counterfeit Gold

3397.    Counterfeit Gold. Fuse together 8 parts platinum, 5 parts pure copper, 2 parts pure zinc, 4 parts tin, and 3 parts pure lead, using saltpetre, sal-ammoniac, and powdered charcoal as fluxes. This compound metal strongly resembles gold in appearance, and resists many of the tests used for gold.

3398. Hard Gold

3398.    Hard Gold. A mixture of 7 parts gold and 1 part copper appears to afford the maximum of hardness.

3399. Coin Gold

3399.    Coin Gold. Melt together with saltpetre and sal-ammoniac, 22 grains pure gold with 2 grains of pure copper. The later American coin is alloyed with 2 grains of a mixture of 1 part silver and 2 parts copper. The copper used for alloying gold must be pure, otherwise the mixture will be brittle.

3400. To Make Eighteen Carat Gold

3400.    To Make Eighteen Carat Gold. Pure gold, 18 parts, is alloyed with 4 parts pure copper and 2 parts silver. Or: 191/2 parts coin gold, 3 parts copper, and 11/2 parts silver.

3401. To Make Sixteen Carat Gold

3401.    To Make Sixteen Carat Gold. Sixteen parts pure gold are mixed with 54 parts copper, and 21/2 parts silver. Or: 17 parts coin gold, 5 parts copper, and 2 parts silver.

3402. To Make Twelve Carat Gold

3402.    To Make Twelve Carat Gold. Coin gold, 75 parts; further alloyed with 40 parts copper, and 22 parts silver, make a com-bination of good appearance, which stands acid tests well.

3403. To Make Four Carat Gold

3403.    To Make Four Carat Gold. A good useful metal for cheap rings, etc.. which will not blacken the finger, is made by mixing 4 parts gold with 2 parts silver, and 18 parts copper.

3404. To Make Green Gold

3404.     To Make Green Gold. Pure gold, 19 parts, and 5 parts pure silver, combine to form an alloy of a beautiful green shade, very effective for foliated designs in jewelry.

3405. Pivots for Artificial Teeth

3405.     Pivots for Artificial Teeth. An alloy of platinum and silver is used for this purpose.

3406. Chaudet's Springs for Artificial Teeth

3406.     Chaudet's Springs for Artificial Teeth. Equal parts of copper, silver, and palladium.

3407. Hard Silver

3407.    Hard Silver. An alloy of 5 parts silver and 1 part copper forms the hardest alloy of these metals.

3408. French Coin Silver

3408.    French Coin Silver. This consists of 9 parts silver and 1 part copper.

3409. German Silver

3409.    German Silver. This is a well-known alloy, the finer varieties of which nearly equal silver in whiteness and susceptibility of receiving a high polish, while they surpass it in hardness and durability. The mixture of the metals is effected in the same way as is given for making alloys. (See No. 3347.) The receipts here given are from the highest authorities, or are the results of actual analysis of the finest commercial samples.