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Ammonium alum, (NH4)2SO4.Al2(SO4)3

Ammonium alum, (NH4)2SO4.Al2(SO4)3.24H2O, was formerly manufactured in England to a very large extent, but at the present time it is mainly the potassium salt that is prepared. Commercial alum is often a mixture of potassium and ammonium alums.

Ammonium aluminium sulphate octahydrate, (NH4)2SO4.Al2(SO4)3.8H2O, may be prepared like the corresponding potassium salt (Marino), or by seeding a supersaturated solution of ammonium alum with a crystal of the corresponding thallic salt, (NH4)2SO4.Tl2(SO4)3.8H2O.

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