Here is a nice introduction to alchemy.
It is common today to think of alchemy as the mere precursor of chemistry or a primitive and not very accurate attempt to describe nature. This is entirely untrue. Alchemy, from its beginnings, was a means to transform the human soul from its base (lead) state to its Enlightened and eternal state (gold). Alchemy lies at the heart of the world’s three dominant modern religions.
Link: A Brief History of Alchemy
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