Dictionary.net

Liver of sulphur, consisting essentially of two equivalents (about 65 per cent.) of potassium trisulphid and one equivalent (about 35 per cent.) of potassium thiosulphate. Pure p. sulphurata (liver of sulphur) is an amorphous substance, liver colored when fresh, afterward of. a greenish or yellowish hue, turning to a dirty green if the access of air is not prevented. It has an odor of hydrogen sulphid, is deliquescent in moist air, and is completely soluble in 2 parts of water.

A preparation made like that of the 1st def., but with crude potassium carbonate and unwashed sulphur. It consists essentially of the same constituents. If, however, the process of heating is carried too far, the thiosulphate is decomposed into potassium sulphate and potassium pentasulphid, the latter breaking up again into sulphur and potassium trisulphid. This impure liver of sulphur has essentially the same properties as the purer variety, but is employed externally [U. S. Ph., 1890, Br. Ph.].[Lat.]