Aluminium hydroxide, sulphuric acid, and ammonium sulphate are used to make Ammonium Alum. Alumina like this is used to make grinding powders and as a precursor to synthetic jewels. Although ammonium alum is neither a common industrial chemical or a very valuable laboratory reagent, it is inexpensive and effective, making it ideal for a variety of niche applications. It is utilised in water purification, porcelain cements, vegetable glues, tanning, deodorants, dyeing, and fireproofing fabrics, etc. Animal repellent sprays also include ammonium alum.