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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.
Do NOT use aluminum sulfate, as this material is toxic to blueberries. A few months ago I called my local nursery to ask if they carried ammonium sulfate. He said Oh, you want aluminum sulfate to acidify the soil for blueberries.. I cringed in horror that this advice is being dispensed so regularly.