A kind of crystalized sulfate of aluminium , water soluatable and a good astrigent ; widely used in deodorant products . can mixed with grapefruit extract , glycerin and demineralized water to make toners 是一種鋁鹽成、無色無味的晶狀物質(zhì),可溶于水中,具有很好的收斂及止血功能,也具止汗功能,很多止汗劑也會添加明礬的成分.可加入葡萄柚萃取液、甘油、純水做收?水。