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<p>[QUOTE=&quot;johnmilton, post: 3657147, member: 101855&quot;]Black corrosion on a silver coin is death. I don&#039;t like &quot;carbon spots&quot; and avoid coins that have them. If there is a fair amount of black corrosion, that coin is a pass for me. That especailly goes for Proof coins when the toning as gone to the point of killing mirrors. I don&#039;t care if it&#039;s &quot;original,&quot; I won&#039;t have anything to do with them.</p><p><br /></p><p>I once had a customer when I was dealer who wanted to trade-in on a purchase for&nbsp; a commemorative coin in an NGC holder that was totally black. I told him that I was the worst person to give him an offer on that piece. He pushed me to do it anyway, so I gave him 50% of Blue Sheet. I blew the thing off to a dealer for a small mark-up ASAP. I don&#039;t want to sell it to a customer or hold it. To me the coin was dead.[/QUOTE]</p><p><br /></p>

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