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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.
Another point of confusion is the toxicity of ammonia and ammonium ions. Ammonia is toxic whereas, free ammonium ions by themselves are not (though they can be converted by certain bacteria in aquatic environments to nitrates, which in turn are toxic).