ALUM
Alum refers to a class of double sulfate salts, most commonly Potassium Aluminum Sulfate (potassium alum), used for water purification, as an astringent (aftershave, styptic), in dyeing, and baking; it's a crystalline mineral known for its antiseptic, tightening properties, often called phitkari in India, available as blocks or powder, and can also informally mean an alumnus/alumna.
Chemical & Physical Properties:
- Type: A hydrated double sulfate salt, usually of aluminum and a monovalent cation (K, Na, NH4).
- Appearance: Colorless, clear, crystalline solid or granular powder with an astringent taste.
How it Works (Astringent):
- Alum tightens tissues, reduces inflammation, and acts as a mild antiseptic by disinfecting surfaces and inhibiting bacterial growth, making it great for skincare and oral hygiene.
