Alchemy refers to both an early protoscience and an early philosophical discipline, both combining elements of chemistry, metallurgy, physics, medicine, astrology, semiotics, mysticism, spiritualism, and art. Alchemy has been practiced in Mesopotamia, Ancient Egypt, Persia, India, and China, in Classical Greece and Rome, in the Islamic Caliphates, and then in Europe up to the 19th century - in a complex network of schools and philosophical systems spanning at least 2500 years.
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