This section is from the book "Dental Medicine. A Manual Of Dental Materia Medica And Therapeutics", by Ferdinand J. S. Gorgas. Also available from Amazon: Dental Medicine.
First free the ordinary cotton wool from grease, by macerating it in benzine for ten minutes, press and dry in the air. Then steep the purified cotton, for ten minutes, in a solution of tannin 5, carbolic acid 4, alcohol 50, and castor oil 8 parts.