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<p>[QUOTE=&quot;desertgem, post: 13940552, member: 15199&quot;]Use Modern Chemistry to help. I use Amazon as a source, but some local hardware or craft stores might also have copper foil strips ( some have adhesive backing to stick on whatever you store coins in ( especially good for copper containing coins). </p><p><br /></p><p>Use very fine emery paper to scratch up a length of the foil lightly. The copper foil will be more attractive to corrosive chemical molecules than the copper alloy coins. Works great within a safe. Similar function as in &quot;Intercept&quot; coin products, but not as expensive. Change or resand the copper surface when it turns brownish.</p><p>IMO, Jim[/QUOTE]</p><p><br /></p>

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