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I do believe ultimately your pharmacist is correct, but from a chemists stand point is completely wrong. Ammonium alum has a smaller molecular composition opposed to Potassium; that is why it burns...

I have had 2 alum blocks my first was replaced after appx 4-5 months because as others have said the inevitable slip and break. That block though ( shavex ) had at least before breaking lost 50% of...