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<p>[QUOTE=&quot;johnmilton, post: 7993299, member: 101855&quot;]Yes. The chemicals they used to turn the coin red may have not been completely rinsed off the coin. They reacted with the virgin metal that was exposed and gave you the result you see. This can happen in less than a year. </p><p><br /></p><p>Even if the chemicals are properly removed, the virgin metal left after the dipping is very vulnerable to turning brown. It’s more delicate that the original mint surface that’s on the coin when it is struck.</p><p><br /></p><p>This is why I advise people to buy red copper in old certification holders. If something bad is going to happen, the chances are high that would have happened between the time the coin was slabbed an now.</p><p><br /></p><p>As a general policy, I stay away from red copper, especially on old coins that are expensive. Buying it is not worth the risk, and the grading services won’t support you if things go wrong. NGC has reached the point where they won’t guarantee a copper coin beyond ten years. Before that time goes by, you have to have the coin re-certified.[/QUOTE]</p><p><br /></p>

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