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<p>[QUOTE=&quot;desertgem, post: 2037111, member: 15199&quot;]Here is the singular paper that initiated the discussions here on this subject. the authors were using a grant from a company that promoted a copper cleaning agent ( for joining copper tubing) to the exclusion of acetone which was many times cheaper. I have traced this work several times, but it hasn&#039;t seemed to pass through peer-reviewed publications. For this to affect copper coinage would require storage conditions that are not practiced ( and in my opinion would not even under such conditions).</p><p><br /></p><p><a href="http://www.sciencedirect.com/science/article/pii/S0013468601003590" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.sciencedirect.com/science/article/pii/S0013468601003590" rel="nofollow">http://www.sciencedirect.com/science/article/pii/S0013468601003590</a>[/QUOTE]</p><p><br /></p>

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