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<p>[QUOTE=&quot;ldhair, post: 8060100, member: 11540&quot;]Copper starts to tone the moment it is struck. Slabs can slow it down but not stop it. I know a few collectors that don&#039;t collect red copper because of it. I have a lot of cents in slabs that have gone from red to RB and even to brown over the years. </p><p>Not a good thing as far as value goes.[/QUOTE]</p><p><br /></p>

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