Such alumina is used in the production of grinding powders and as precursors to synthetic gems.

[3] Ammonium alum is not a major industrial chemical or a particularly useful laboratory reagent, but it is cheap and effective, which invites many niche applications.

It is used in water purification, in vegetable glues, in porcelain cements, in deodorants and in tanning, dyeing and in fireproofing textiles.

[4] The pH of the solution resulting from the topical application of ammonium alum with perspiration is typically in the slightly acid range, from 3 to 5.

[5] Ammonium alum is a common ingredient in animal repellent sprays.