Aluminum sulfate



a white, crystalline, water-soluble solid, Al 2 (SO 4) 3 , used chiefly as a water-purifying agent, as a mordant, and as a size in the manufacture of paper.
Historical Examples

Vitriol is copper or iron sulfate, saltpeter is potassium nitrate, and alum is an aluminum sulfate salt.
Rembrandt’s Etching Technique: An Example Peter Morse

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