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..
Heat in a crucible a mixture of sublimed Sulphur, 100; and dried Potassium Carbonate, 200. 3K2Co3+4S2=K2S2O3+2K2S3+3Co2.
When freshly prepared it forms irregular pieces of a liver-brown color, which, by exposure to the air, gradually absorb moisture, Oxygen, and Carbon Dioxide, and change to a greenish-yellow and finally a gray mass, containing Potassium Carbonate, Hyposulphite and Sulphate. The compound has a faint odor of Hydrogen Sulphide, and a bitter, alkaline taste. Solubility. - In 2 parts of water.