This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Deep gold | Pure | Pale | |
gold | gold | ||
Per cent | Per cent | Per cent | |
84.5 | 78 | 76 | |
15.5 | 22 | 14 | |
Deep | Deep | ||
gold | gold | Gold | |
Per cent | Per cent | Per cent | |
91 | 86 | 83 | |
Zinc..... | 9 | 14 | 17 |
dark | pale | ||
reddish | yellow | yellow |
Alloy of tin and zinc; harder than tin and softer than zinc: Zinc, 1 part; tin. 11 parts.
Dissolve finely cut isinglass in a little water with moderate heat, which must
not be increased to a boil, and add as much nitric acid as has been used of the isinglass. The adhesive will not penetrate the cardboard or paper.
 
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