Alum is a chemical compound of aluminium  and sulphur found in nature and has been used in a large variety of ways since ancient times.
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Alum refers to astringent crystalline double sulfate of an alkali. K2SO4AL2 (SO4)3 24H2O. Used in the processing of pickles and as a flocking agent. Excess aluminum in the environment can be hazardous.
Ref: 86393/2006-09-14

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List of books: Alum

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