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<p>[QUOTE=&quot;desertgem, post: 1488647, member: 15199&quot;]I still wonder why people use such products when the same effect can be obtained from a few well scruffed ( previously bu) new cents laying loose in the box. </p><p><br /></p><p>Intercept (tm) products of corrosion control originated with inventions&nbsp; and patents at Lucent labs ( AT&amp;T ) for packaging made of polymer&nbsp; bound reactive metals to &quot;intercept&quot; corrosive compounds such as&nbsp; sulfides and bind them chemically, thus removing them from circulation&nbsp; within the sealed plastic bag( U.S. Pat. No. 4,944,916) issued to Franey&nbsp; However, this reactive metal coating was semi-opaque and rather&nbsp; expensive ( and to me rather ugly). Then&nbsp; a patent was granted to bind the reactive component to paper and&nbsp; other cellulose products. Here is a patent that explains this process&nbsp; and which led to the introduction of intercept (tm) coin products.</p><p>&nbsp;</p><p>&nbsp;<a href="http://www.freepatentsonline.com/6593007.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.freepatentsonline.com/6593007.html" rel="nofollow">http://www.freepatentsonline.com/6593007.html</a></p><p>&nbsp;</p><p>This process is not forever. There is a set amount of reactive material&nbsp; in the cardboard used for albums and boxes, and once it is fully&nbsp; reacted, it can not be reactivated, and also there is little indication&nbsp; as to how much reactive power is still present. Just an estimate in&nbsp; number of years it could protect under normal conditions. If you live in&nbsp; a heavy industrialized area, it would be quite less. </p><p>&nbsp;</p><p>&nbsp;&nbsp; A sacrificial anode is basically the low tech answer to the above&nbsp; product. The more active metal is more easily oxidized than the&nbsp; protected metal ( patina)and corrodes first (hence the term &quot;sacrificial&quot;); it&nbsp; generally must react nearly completely before the less active metal will&nbsp; corrode, thus acting as a barrier against corrosion for the protected&nbsp; metal.</p><p>&nbsp;</p><p>&nbsp;&nbsp;&nbsp; Since the post 1982 cents have a coating of pure copper, it could&nbsp; qualify for this purpose, especially if it was protecting copper&nbsp; containing coins that by having developed a patina would be less&nbsp; reactive than pure copper. But to make the copper sacrificial coin more&nbsp; attractive, it should be abraded and&nbsp; cleaned severely prior to use. Since the same environmental agents that attack copper chemically will also find silver as attractive , the anode coin will protect them also.</p><p>&nbsp;<p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p><p><br /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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