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<p>[QUOTE=&quot;Just Carl, post: 267286, member: 4552&quot;]Basically what said is true. However, note the almost complete Copper is still&nbsp; similar to the Copper coating on a Zinc coin. The Zinc has no part in a chemical reaction with any solution unless the copper coating is damaged. The problem is usually in the variety of contaminates on the surface of the coins and/or the cleaning solutions being contaminated with other substances. Although the Copper on the 1915 and the 1995 is basically the same, it is obviously not exactly the same. Also, there is a thing called tolerences in manufacturing of anything and the sheets of material used to make coins is no exception. Please note I said I did the same thing with the 1915 as with the 1995. Any substances on the 95 are now in the solution used for the 15 so that in itself is a contaminate. I forgot to note that these cleaning agents have been used in tha past for cleaning other items so again, more contaminates present.[/QUOTE]</p><p><br /></p>

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