Hi Caroline and Dennis, i used the alum in a crock pot where the alum started to steam. I haven't had many items in the pickle so the concentration must be okay. The dark colour doesn't rub off easily i tried soap and toothbrush, brass brush and eventually went with green scrubby and bon ami to remove it. Caroline interesting that it should come out matt pink in the alum, suggests there's something i'm doing wrong. As long as i know the alum should work for copper then hopefully i'll figure it out.
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