Captain Fawcett Traditional Alum Bar is an incredibly hard, crystalline stone that only becomes active once wetted and brought into contact with skin. It then immediately gets to work, instilling antiseptic and antiperspirant properties into your skin through a thin protective layer. Forming almost a seal over skin, it allows the Bar to clear out your pores and halt the bleeding caused by occasional shaving nicks. For more information about how to use an alum block, please visit our blog entry about alum blocks: Alum Block Information