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<p>[QUOTE=&quot;desertgem, post: 2166343, member: 15199&quot;]The &#039;green &#039; part is part of both and are the various copper compounds formed by corrosion. If it is shiny and sticky appearing , the copper compounds are part of the plasticizers used in flexible PVC holders. If the compounds are dry and flaky they are just copper compounds &quot;in situ&quot;, attached to the metal, called various names, corrosion, verdigris, &#039;bronze disease&#039;, etc. Acetone works against the PVC plasticizers problem, and I also agree about Badthad&#039;s , having used with excellent effects over the years.</p><p><br /></p><p>Since we never know what appearance the metal has under the green, such as pitting or scratches, one should consider which is the worse of the evils <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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