Natural Deodorant Stone. Deodorant stones have been used in the Far East for hundreds of years as a body and foot prophylactic. Stones are 100% natural, made from mineral salts and ammonium. These stones do not stop perspiration but attack the bacteria which cause odours. When applied the stones leave a thin layer of mineral salts on the skin which cannot be seen or felt. Simply wet the stone, and apply like you would a roll-on. Let the stone dry before putting away. DO NOT leave the stone in water. Stones do not stain clothing, and should last at least 6 months.