Brand from France: Najel. Alum stone is a mineral naturally present in various parts of the world.NAJEL alum powder is obtained from alum crystals extracted from natural alunite quarries.The crystals are reduced to powder by an alum stone processor in France.Alum powder has antibacterial properties to prevent the formation of bacteria responsible for unpleasant odours.A perspiration regulator, it is used to make natural deodorant and it prevents the formation of fungi.It's astringent properties are also recommended for skin prone to acne.NAJEL recommends it for foot care, diluted in the warm water of afoot bath or sprinkled inside your shoesto eliminate unpleasant odours.It may also be used as an after-shave treatment.How to use:Foot care spa at home! - to keep your feet soft & protected:Soak them in a bowl of warm water with 2 tbsp of alum powder for 10-20 minutes.Once the skin has softened, use the Najel pumice stone to remove rough skin.Rinse and dry your feet.Moisturize them with butter