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<p>[QUOTE=&quot;johnmilton, post: 26273323, member: 101855&quot;]The toning on these coins is created by a chemical reaction. Is the coin stable or not? No one really knowns. Copper is the most reactive of three classic coinage metals. Gold is quite inert and silver tones over time. </p><p><br /></p><p>Here is an example of how things can go wrong. This 1963 cent was graded PR-70 Ultra Cameo. It was the finest graded, and brought something like $40,000 in an auction at some point. You can see from these pictures that the coin has spots and could no longer be called a Proof 70. Yet it came for auction and still got very high bids simply because it was the finest graded which gave the owner the most registry points. </p><p><br /></p><p>[ATTACH=full]1678363[/ATTACH] [ATTACH=full]1678364[/ATTACH] </p><p><br /></p><p>When the piece came for auction, there was a storm of messages on the PCGS blog which pointed out the issues. Finally PCGS bought the coin off the market to stem the issue. </p><p><br /></p><p>The point is these coins are very delicate. It seems to get worse when they are removed from their mint packaging. Collectors should realize that there are risks connected with these coins that are beyond what the market can do.[/QUOTE]</p><p><br /></p>

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