alum
Sign in to savethumb|upright=1.5|Crystal of potassium alum,
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Article
26 sectionsContents
- 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.