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<p>[QUOTE=&quot;desertgem, post: 8359198, member: 15199&quot;]They are called sacrificial metals and they differ, Zinc is used to protect iron/steel,&nbsp; for instance, for&nbsp; silver and copper coins, unless they are less than than a year or so from the mint, an oxidation film has started being formed if the coin that wasn&#039;t in a sealed environment. The speed is also determined by the area of the world the coin is in. Heavy industry with smoke spewing chimneys are the worst. The middle of a desert is maybe the best. Moisture ( even in the environment or home) can also accelerate the chemical reaction. The roughened copper sheet has a stronger rate of reacting to the chemicals&nbsp; than a&nbsp; 90% copper coin with minor exposure. But once the copper sheet starts to turn darker , it may switch. That is why it has to be roughened up again to regain full activity.&nbsp; Your flips are probably good at keeping the levels low, but if you live in certain areas , sacrificial metal in a box will help the chemical reaction less of a problem. </p><p>&nbsp;&nbsp; &nbsp; Also , I would think about storing in an antique wood box or drawers, Certain wood can damage metals also.</p><p><a href="http://www.vam.ac.uk/content/journals/conservation-journal/issue-04/corrosion-of-metals-associated-with-wood/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.vam.ac.uk/content/journals/conservation-journal/issue-04/corrosion-of-metals-associated-with-wood/" rel="nofollow">http://www.vam.ac.uk/content/journals/conservation-journal/issue-04/corrosion-of-metals-associated-with-wood/</a></p><p><br /></p><p>I am all bad news I guess <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />&nbsp; Jim[/QUOTE]</p><p><br /></p>

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