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<p>[QUOTE=&quot;desertgem, post: 635484, member: 15199&quot;]Here is the patent that underlies the product. </p><p><a href="http://www.patentstorm.us/patents/6752934/description.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.patentstorm.us/patents/6752934/description.html" rel="nofollow">http://www.patentstorm.us/patents/6752934/description.html</a></p><p><br /></p><p>A quick reading seems to indicate it works by enforcing ( increasing) the inherent oxidation layer on metal ( copper and other) and preventing further oxidation there after. I would be concerned with Red or red brown copper coins myself turning slightly more brown. You will notice that silver is not mentioned. Near the end of the description it mentions the production of acids.</p><p><br /></p><p>I would vastly prefer silica gel or intercept(tm) products over this product which seems more towards the protection of commercial metals rather than coins. There is good support chemically for putting some new (change) harshly cleaned, rinsed and dried copper coins loose in the storage unit as sacrificial coins to be replaced as they start to turn, sparing your other coins.</p><p><br /></p><p>IMHO. I would like some of the other chemists on the forum to give their opinions.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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