This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
Sheep's wool is. treated with a weak soda solution, and the solution acidulated. The remaining wool is treated with Benzin, the liquid distilled, and the residue deprived of color by oxidizing agents, or sunlight.
A yellowish-white or nearly white, ointment-like mass, having a faint, peculiar odor.
Insoluble in water, but miscible with twice its weight of the latter, without losing its ointment-like character.
Hydrous wool-fat when gently rubbed in the skin is more quickly absorbed than most fats, hence it is a useful basis if we wish to administer substances - as, for example, mercury - by inunction. It is undoubtedly soothing to the skin, and often makes an excellent basis for ointments expected to act especially upon the skin.