Alchemy Alphabet: SAFFRON of COPPER (Crocus veneris, Aes ustum, Venus calciné), copper calcined, red powder (Colcothar). Cupric oxide, Cuprous oxide.

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Alchemy Alphabet: SAFFRON of COPPER (Crocus veneris, Aes ustum, Venus calciné), copper calcined to red powder (Colcothar, Calcanthum). Cupric oxide, Cuprous oxide: Chemical formula=[Cu₂O].

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