Occurs in Nature in free and combined states, being already known in the Antiquity by its color, combustion easiness and scent. Homer mentions the use of its combustion products as disinfectant, and Dioscoride also describes its application in Medicine. It was well known to the alchemists, just as sulfuric acid, compound of this element. In 1772 Lavoisier proved that the sulfur is an elementary substance.