Alum is commonly used as an important part of many products created by the pharmaceutical, cosmetic and food industries because of its astringency property; it is also used in paper, glues and explosives.
Alum is quite a safe chemical, however many cause irritation or if inhaled or digested. It also may cause itching, pain or irritation if come in contact with eyes and sometimes skin. When handling chemical it is best to wear a protective lab coat and goggles.