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.
Ref: 120943/2006-09-26

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

Other Database Pages Exist for this Phrase:
Secondary aluminum (Secondary aluminum refers to an  aluminum-bearing  ...)
Aluminum (Aluminum makes reference to the  most common ...)
Aluminum spaceframe (Aluminum spaceframe  refers to an  integrated ...)

List of books: Alum

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