The coagulating power of alum is high. It precipitates Colloidal Solution. This property of alum is used to stop the bleeding. It prevents blood from flowing through it.
The coagulating power of alum is also used in purifying water. It precipitates colloidal impurities present in the water, which can be filtered and separated.
It uses in calico printing
Leather is used in rubbing and in paper factories.
Used as a mordant in extinguishing fire and in dyeing of clothes.