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<p>[QUOTE="TypeCoin971793, post: 2953517, member: 78244"]A friend at a coin club opened up a mint-sealed commemorative set and found that the silver dollar had extremely vibrant toning because the air-tight holder was not closed and the sulfur-rich packaging caused the toning. I believed him, and the toning patterns back up his story (the edge clearly showed where the gap in the air-tight began), but the toning seemed too vibrant to be natural. He has not sent it in for grading yet, so I don't know if it got nuked.[/QUOTE]</p><p><br /></p>
[QUOTE="TypeCoin971793, post: 2953517, member: 78244"]A friend at a coin club opened up a mint-sealed commemorative set and found that the silver dollar had extremely vibrant toning because the air-tight holder was not closed and the sulfur-rich packaging caused the toning. I believed him, and the toning patterns back up his story (the edge clearly showed where the gap in the air-tight began), but the toning seemed too vibrant to be natural. He has not sent it in for grading yet, so I don't know if it got nuked.[/QUOTE]
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Natural vs. artificial toning
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