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Alum stone is a natural crystalline powder derived from alumina and alum shale, which are aluminium oxides and hydroxides. They are chemically inert (i.e. non-reactive), so there is no risk of the alum releasing aluminium . The L’OCCITANE Crystal Deodorant Stone is 100% alum stone and acts as a natural deodorant thanks to its astringent and purifying properties.
