This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Probably the simplest and cheapest as well as the best method of coloring benzine green is to dissolve in it sufficient oil soluble aniline green of the desired tint to give the required shade.
Ill-smelling benzine, mixed with about 1 to 2 per cent of its weight of free fatty acid, will dissolve therein. One-fourth per cent of tannin is added and all is mixed well. Enough potash or soda lye, or even lime milk, is added until the fatty acids are saponified, and the tannic acid is neutralized, shaking repeatedly. After a while the milky liquid separates into two layers, viz., a salty, soapy, mud-sediment and clear, colorless, and almost odorless benzine above. This benzine, filtered, may be employed for many technical purposes, but gives an excellent, pure product upon a second distillation.
Fatty acid from tallow, olive oil, or other fats may be used, but care should be taken that they have as slight an odor of rancid fat as possible. The so-called elaine or olein — more correctly oleic acid —of the candle factories may likewise be employed, but it should first be agitated with a 1/10-per-cent soda solution to get rid of the bad-smelling fatty acids, especially the butyric acid.
A mixture of 9 volumes tetrachloride and 1 volume of benzine is practicably inflammable. The flame is soon extinguished by itself.
Chloroform......... 75 parts
Ether............... 75 parts
Decoction of quillaya
Acetic ether, technically pure....... 10 parts
Amyl acetate........ 10 parts
Ammonia water..... 10 parts
Alcohol dilute....... 70 parts
Acetone............. 1 part
Ammonia water...... 1 part
Alcohol dilute........ 1 part