Alum

Alum refers to a group of chemical compounds, typically potassium aluminum sulfate, used for a variety of purposes. Commonly, alum is employed in water purification to remove suspended particles and improve clarity. It also acts as a mordant in dyeing textiles, helping colors bind better. Additionally, alum has uses in personal care products, such as natural deodorants, due to its antibacterial properties, and in cooking as a food additive for pickling and baking. Its versatility stems from its ability to cause particles to clump together and its mild antiseptic qualities, making it useful in sanitation and preservation.