Alum is a compound that contains aluminum. In cosmetics, alum usually refers to potassium alum, which has astringent and antibacterial properties. However, it may not be safe for long-term use. An ...

Potassium nitrate (KNO 3), known historically as saltpeter or the mineral niter, is a common salt with multiple uses.It has been known since antiquity; an early appearance in the chemical literature ...