Alchemy Alphabet: ALUM (Alumen). Potassium alum, Potassium-Aluminium sulfate, Aluminum salt: Chemical formula=[KAl(SO₄)₂•12H₂O] or [Al₂(SO₄)₃].

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Alchemy Alphabet: ALUM (Alumen), also: Vitriol of Argile (vitriol of clay), Atramentum sutorium. Potassium alum, Aluminium sulfate, Aluminum salt: Chemical formula=[KAl(SO₄)₂•12H₂O] or [Al₂(SO₄)₃].

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