Two peasants hold a red robe; cherubs blow wind and Mercury rests on water below; representing a stage in the process of alchemy. Coloured etching, ca. 18th century.

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Credit: Two peasants hold a red robe; cherubs blow wind and Mercury rests on water below; representing a stage in the process of alchemy. Coloured etching, ca. 18th century. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)