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<p>[QUOTE=&quot;Jim Dale, post: 24496234, member: 100459&quot;]I&#039;m not sure I understand.&nbsp; If I have one of my copper coins graded, it will have to be re-graded every ten years because over time, it changes color.&nbsp; From that logic, copper coins will be worth less as time goes on.&nbsp; Is there any treatment, etc. that can preserve a copper coin&#039;s color?&nbsp; I have some really nice pennies that I want to maintain its color.&nbsp; What would be a way to do that?&nbsp; The three coins we got for free from the mint when we bought Proof Sets, are some of them, but I&#039;m sure there are many other copper coins (or copper like coins) that we would want to preserve.&nbsp; Is there a source to tell us how to preserve coins, copper, silver, gold or other coins?[/QUOTE]</p><p><br /></p>

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