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<p>[QUOTE=&quot;-jeffB, post: 8226680, member: 27832&quot;]I don&#039;t think that&#039;s exposed zinc. I think it&#039;s chemically altered copper. You could test that by putting into water with some lye (drain cleaner) dissolved in it. If the central area starts bubbling, it&#039;s exposed zinc; if not, it&#039;s copper.</p><p><br /></p><p>(Careful with the lye water! Don&#039;t get it on your hands, ESPECIALLY don&#039;t get it in your eyes, and flush it down the drain when you&#039;re done.)[/QUOTE]</p><p><br /></p>

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