Alum, a natural mineral found in Europe and used by the Egyptians more than 4,000 years ago, is a shaving essential for any well-groomed man. The Art of Shaving Alum Block"s antiseptic properties calm razor burn and soothe irritations, and help stop bleeding in the event of a nick or cut. Appropriate for all types of skin and can be used as an astringent for oily complexions.