Question

What is the strongest alum solution that can be applied in liquid form?

Answer 1

Ammonium alum has the formula N4Al(SO4)2·12H2O. Ammonium alum is used for many of the same purposes as potassium alum and soda alum. Ammonium alum finds applications in tanning, dyeing textiles, making textiles flame retardant, in the manufacture of porcelain cement and vegetable glues, in water purification and in some deodorants.