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alum

thumb|upright=1.5|Crystal of potassium alum,

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Commons category: Alum

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~14 min read

Article

26 sections

Contents

History
Alum found at archaeological sites
Alumen in Pliny and Dioscorides
Alum described in medieval texts
Modern understanding of the alums
Production
Types
Chemical properties
Crystal structure
Solubility
Uses
Industrial processes
Topical antihemorrhagic
Deodorant
Bread
Textiles and paper
Jewellery
Other
Related compounds
Selenate-containing alums
Mixed alums
Other hydrates
Other double sulfates
See also
References
External links

thumb|upright=1.5|Crystal of potassium alum,

An alum () is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula , such that is a monovalent cation such as potassium or ammonium. By itself, alum often refers to potassium alum, with the formula . Other alums are named after the monovalent ion, such as sodium alum and ammonium alum.