Alchemy. Alchemy was an ancient branch of natural philosophy, a philosophical and protoscientific tradition practised throughout Europe, Africa, and Asia, originating in Greco-Roman Egypt in the first few centuries.
   Alchemists attempted to purify, mature, and perfect certain materials. Common aims were chrysopoeia, the transmutation of base metals into noble metals; the creation of an elixir of immortality; the creation of panaceas able to cure any disease; and the development of an alkahest, a universal solvent.
   The perfection of the human body and soul was thought to permit or result from the alchemical magnum opus and, in the Hellenistic and Western mystery tradition, the achievement of gnosis. In Europe, the creation of a philosopher's stone was variously connected with all of these projects.
   In English, the term is often limited to descriptions of European alchemy, but similar practices existed in the Far East, the Indian subcontinent, and the Muslim world. In Europe, following the 12th-century Renaissance produced by the translation of Medieval Islamic works on science and the rediscovery of Aristotelian philosophy, alchemists played a significant role in early modern science.
   Islamic and European alchemists developed a structure of basic laboratory techniques, theory, terminology, and experimental method, some of which are still in use today. However, they continued antiquity's b
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