What does ammonium alum mean?

ammonium alum meaning in General Dictionary

a white crystalline double sulfate of aluminum: the ammonium dual sulfate of aluminum

Sentence Examples with the word ammonium alum

It is now allowed to stand for some time, decanted from any sediment, and finally mixed with the calculated quantity of potassium sulphate (or if ammonium alum is required, with ammonium sulphate), well agitated, and the alum is thrown down as a finely-divided precipitate of alum meal.

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