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..
Boil Sublimed Sulphur, 100; with Slaked Lime, 50; in water. 6S2+3Ca(OH)2=2CaS5+CaS2O3+3H2O. This gives a solution containing Calcium Sulphide and Calcium Hyposulphite. To it Hydrochloric Acid is added, and Sulphur is thrown down as a very fine precipitate. 2CaS5+ 4HCl=2CaCl3+4S2 2H2S. Wash and dry the precipitate.
A fine, amorphous powder of a pale yellow color, without odor or taste.
Calcium sulphate, which makes it gritty.
Dose, 15 to 60 gr.; 1. to 4. gm.