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Any form of aluminum sulfate could be called alum, including toxic versions of the chemical. However, the type of alum you find used for pickling and in deodorant is potassium alum, KAl(SO 4) 2 Â·12H 2 O. Sodium aluminum sulfate is a type of alum that is used in commercial baking powder.
The answer is that from sulphite, which is toxic, we make sulphate, which is invaluable. Sulphate is anti-inflammatory and anti-depressant. It is needed for making stomach acid and digestive enzymes, so that we can break down the food we eat into useful components.