The following are especially recommended for use on celluloid:

I

Dissolve 4 drachms of brown shellac in 4 ounces of alcohol. Dissolve 7 drachms of borax in 6 ounces of distilled water. Pour the first solution slowly into the second and carefully mix them, after which add 12 grains of aniline dye of the desired color. Violet, blue, green, red, yellow, orange, or black aniline dyes can be used.

Such inks may be used for writing on bottles, and the glass may be cleaned with water without the inscription being impaired.

II

Ferric chloride .... 10 parts

Tannin........... 15 parts

Acetone.......... 100 parts

Dissolve the ferric chloride in a portion of the acetone and the tannin in the residue, and mix the solutions.

III

Dissolve a tar dyestuff of the desired color in anhydrous acetic acid.