II.—A good purple hectograph ink is made as follows: Dissolve 1 part methyl violet in 8 parts of water and add 1 part of glycerine. Gently warm the solution for an hour, and add, when cool, 1/4 part alcohol. Or take methyl violet, 1 part; water, 7 parts; and glycerine, 2 parts.
Black.—
| Methyl violet | 10 parts |
| Nigrosin | 20 parts |
| Glycerine | 30 parts |
| Gum arabic | 5 parts |
| Alcohol | 60 parts |
Blue.—
| Resorcin blue M | 10 parts |
| Dilute acetic acid | 1 part |
| Water | 85 parts |
| Glycerine | 4 parts |
| Alcohol | 10 parts |
Dissolve by heat.
Red.—
| Fuchsin | 10 parts |
| Alcohol | 10 parts |
| Glycerine | 10 parts |
| Water | 50 parts |
Green.—
| Aniline green, water soluble | 15 parts |
| Glycerine | 10 parts |
| Water | 50 parts |
| Alcohol | 10 parts |