Sulfurated potash is a poorly defined mixture of potassium sulfide, potassium polysulfide, potassium thiosulfate, and probably potassium bisulfide. Synonyms include hepar sulfuris, Liver of sulfur, sulfurated potash, sulfurated potassa.

Liver of sulfur is mainly used in metalworking to form a patina, turning copper alloys brown or black.

Liver of sulfur was once used in pharmaceutical preparations such as “white lotion”. At one time sulfurated potash was used to combat arthritis. It is not surprising that it fell into disfavor because sulfides and polysulfides are toxic.

Potassium sulfides are formed when black powder is burned, and are important intermediates in many pyrotechnic effects, such as senko hanabi and some glitter formulations. The compound is not added directly to the fireworks but rather forms during their combustion[2].