This section is from the book "A Text-Book Of Pharmacology, Therapeutics And Materia Medica", by T. Lauder Brunton. Also available from Amazon: A text-book of pharmacology, therapeutics and materia medica.
U.S.P. Preparation. Antimonium Sulphidum Purificatum.
This is the ore from which the other compounds are prepared.
Antimonium Nigrum Purificatum, B.P.; Antimonii Sulphidum Purificatum, U.S.P. Black Antimony, B.P.; Purified Sulphide of Antimony, U.S.P. Sb2S3; 340.
Characters. - A greyish-black crystalline powder, without smell or taste.
Solubility. - It is. insoluble in water or alcohol.
Preparation. - The crude sulphide, purified by fusion, is obtained in very fine powder by elutriation, then digested with ammonia to remove arsenic, washed and dried.
Impurities. - Other sulphides and arsenic.
Tests. - If one grain be dissolved in hydrochloric acid, and the solution, slightly diluted, be gently warmed with a piece of bright copper foil, the copper being washed, dried, and heated in a dry narrow test-tube, no crystalline sublimate (of arsenious anhydride) should form on the upper cool part of the tube.