This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Take a sample about an inch and a half square of the cloth to be tested and plunge it into a tepid alcoholic solution of cyanine. After the coloring matter has been absorbed by the fiber, rinse it in water and then plunge into dilute sulphuric acid. If it is of cotton the sample will be almost completely bleached, while linen preserves the blue color almost unchanged. If the sample be then plunged in ammonia, the blue will be strongly reinforced.
Aromatic cotton is produced as follows : Mix camphor, .5 parts; pine-leaf oil, 5 parts; clove oil, 5 parts; spirit of wine (90 per cent), 80 parts; and distribute evenly on cotton, 500 parts, by means of an atominer. The cotton is left pressed together in a tightly closed tin vessel for a few days.
Cotton waste, in a greasy condition, is placed in an acid-proof apparatus, where it is simultaneously freed from grease, etc., and prepared for bleaching by the following process, which is performed without the waste being removed from the apparatus: (1) treatment with a solvent, such as benzine; (2) steaming, for the purpose of vaporizing and expelling from the cotton waste the solvent still remaining in it after as much as possible of this has been recovered by draining; (3) treatment with a mineral acid; (4) boiling with an alkali lye; (5) washing with water.