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    Alum is not aluminum sulfate. Alum (hydrated...

    Alum is not aluminum sulfate. Alum (hydrated potasium aluminum sulfate) is actually used as a pickling spice and in water treatment so I doubt that it is very toxic.
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    Actually, no I haven't. But I can tell you that...

    Actually, no I haven't. But I can tell you that aluminum sulfate (stiptic pencil) tastes horrible.
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