Violet Ink.
II.—Another good violet ink is made by dissolving some violet aniline in water to which some alcohol has been added. It takes very little aniline to make a large quantity of the ink.
White Ink
White marks may sometimes be made on colored papers by the application of acids or alkalies. The result, of course, depends on the nature of the coloring matter in each instance, and any “ink” of this kind would be efficacious or otherwise, according to the coloring present in the paper.
Yellow Ink.
II.—Boil French berries, 1/2 pound, and alum, 1 ounce, in rain water, 1 quart, for 1/2 an hour, or longer, then strain and dissolve in the hot liquor gum arabic, 1 ounce.
Waterproof Ink
White Stamping Ink.—
| Zinc white | 2 drachms |
| White precipitate | 5 grains |
| Mucilage | 1 drachm |
| Water | 6 drachms |
Triturate the zinc white with a small quantity of water till quite smooth, then add the mucilage and the remainder of the water.