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To Make Eighteen Carat Gold

Pure gold, 18 parts, is alloyed with 4 parts pure copper and 2 parts silver. Or: 19½ parts coin gold, 3 parts copper, and 1½ parts silver. 3401. Το Make Sixteen Carat Gold.

Sixteen parts pure gold are mixed with parts copper, and 2½ parts silver. Or: 17 parts coin gold, 5 parts copper, and 2 parts silver.