Coloring Agents:
Red.—
| I.— | Bordeaux red, O. S. | 15 parts |
|---|---|---|
| Aniline red, O. S. | 15 parts | |
| Crude oleic acid | 45 parts | |
| Castor oil enough to make | 1,000 parts |
Rub the colors up with the oleic acid, add the oil, warming the whole to 100° to 110° F. (not higher), under constant stirring. If the color is not sufficiently intense for your purposes, rub up a trifle more of it with oleic acid, and add it to the ink. By a little experimentation you can get an ink exactly to your desire in the matter.
Blue-Black.—
| II.— | Aniline black, O. S. | 5 parts |
|---|---|---|
| Oleic acid, crude | 5 parts | |
| Castor oil, quantity sufficient to | 100 parts. |
Violet.—
| III.— | Aniline violet, O. S. | 3 parts |
|---|---|---|
| Crude oleic acid | 5 parts | |
| Castor oil, quantity sufficient to | 100 parts. |
The penetration of the ink may be increased ad libitum by the addition of a few drops of absolute alcohol, or, better, of benzol.