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Old July 26, 2012, 04:38 PM   #3
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Join Date: February 16, 2006
Location: IOWA
Posts: 6,269
How did that get on there?

You might be refering to a substance called VERDIGRIS, which will form on copper or brass. I have not seen it do any damage to the leather and not entirely sure how it effects steel or SS? Sometimes it can build up pretty good. ...

a green or greenish-blue poisonous pigment resulting from the action of acetic acid on copper and consisting of one or more basic copper acetates
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