This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Fine gold, 18 pennyweights, 12 grains; fine silver, 1 pennyweight; fine copper, 12 grains.
Dry Colored Gold Alloys, 17 Carat.—Fine gold, 15 pennyweights; fine silver, 1 pennyweight, 10 grains; fine copper, 4 pennyweights, 17 grains.
18 Carat.—Fine gold, 1 ounce; fine silver, 4 pennyweights, 10 grains; fine copper, 2 pennyweights, 5 grains.
18 Carat.—Fine gold, 15 pennyweights; fine silver, 2 pennyweights, 4 grains; fine copper, 2 pennyweights, 19 grains.
18 Carat.—Fine gold, 18 pennyweights; fine silver, 2 pennyweights, 18
grains; fine copper, 3 pennyweights, 18 grains.
19 Carat.—Fine gold, 1 ounce; fine silver, 2 pennyweights, 6 grains; fine copper, 3 pennyweights, 12 grains.
20 Carat.—Fine gold, 1 ounce; fine silver, 2 pennyweights; fine copper,
2 pennyweights, 4 grains.
22 Carat.—Fine gold, 18 pennyweights; fine silver, 12 grains; fine copper, 1 pennyweight, 3 grains.
Gold Solder for the Foregoing Alloys.—Take of the alloyed gold you are using, 1 pennyweight; fine silver, 6 grains.
Alloy for Dry Colored Rings.— Fine gold, 1 ounce; fine silver, 4 pennyweights, 6 grains; fine copper, 4 pennyweights, 6 grains.
Solder.—Scrap gold, 2 ounces; fine silver, 3 pennyweights; fine copper,
3 pennyweights.
Dry Colored Scrap Reduced to 35s. Gold.—Colored scrap, 1 ounce, 9 pennyweights, 12 grains; fine silver, 2 pennyweights; fine copper, 17 pennyweights, 12 grains; spelter, 4 pennyweights.
 
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