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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.
Lead (II) sulfate is also partially soluble in diluted hydrogen chloride and nitric acid. It is soluble in sodium hydroxide and ammonium acetate. Lead (II) sulfate, like all lead compounds, is toxic to humans. It is readily absorbed by the skin and can cause injury to the central nervous system and birth defects. Ingesting large quantities of lead (II) sulfate can cause seizures, coma and even death.