Aluminum Ammonium Sulfate Ammonium
· Aluminum Ammonium Sulfate or Ammonium Alum occurs as large, colorless crystals, white granules, or a powder. One gram dissolves in 7 mL of water at 25° and in about mL of boiling water. Solutions are acid to litmus. It is insoluble in alcohol, and is freely, but slowly, soluble in glycerin.