Alum potassium sulfate dodecahydrate'. in the form of potassium aluminum sulfate in a concentrated bath of hot water is routinely used by jewelers and machinists to dissolve hardened steel drill bits that form aluminum, copper, brass, gold and silver (both sterling and fine). Items made from are broken. To reduce body odour: It controls body odour. It can be applied directly on the sweaty areas of the body. Since it is water soluble, it mixes with sweat and inhibits the growth of bacteria that causes body odour. People who are suffering from foot odor problem should apply it on their feet regularly before sleeping to get relief from it To purify water: When a small amount of alum powder is added to water, small particles of pollutants present in the water stick together and form colloid pa