Alum is an aluminum compound with many uses. Alum blocks as antiperspirant deodorants to reduce post-shave irritation or stop bleeding from small cuts. Alum is an astringent and bacteriostatic agent, meaning it inhibits bacterial growth.
Alum has several household and industrial uses such as:
- purification of drinking water as a chemical flocculant
- in styptic pencil to stop bleeding from minor cuts
- the adjuvant in vaccines ( a chemical that enhances the immune response)
- deodorant “rock”
- pickling agent to help keep pickles crisp
- flame retardant
- the acidic component of some types of baking powder
- an ingredient in some homemade and commercial modeling clay
- an ingredient in some depilatory (hair removal) waxes
- skin whitener
- ingredient in some brands of toothpaste
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