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Alum on the fingers of your non razor hand helps to grip onto wet skin when stretching. I saw the pic you posted pixel, that was one of at least two threads talking about alum tarnish. I thought a...

I have seen a few threads recently that talk about alum tarnishing steel, what I want to know is whether that tarnish is harmful or not. If its just discolouration then it wouldnt worry me, but if...