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Green Gunk on Silver Coins (1921 SLQ) - What to Do?
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<p>[QUOTE="Publius2, post: 8313366, member: 105571"]More information, please. It's slabbed by NGC. Did it straight-grade? Your OP implies it did. Did it look this way when it was slabbed or did you buy it this way? If it turned in the holder since you bought it, how long was it in your possession before it started exhibiting this look? What environment has the coin/slab been in since you acquired it and how long have you had it?</p><p><br /></p><p>Now for rank speculation: It probably hasn't been in this slab earlier than 2008 when the Edge View was introduced. I doubt that NGC would have slabbed it, even in a details holder, if it had PVC contamination/damage. Yes, they make mistakes but that's not usually one of them. If the coin was damaged by PVC, I would expect to see some pitting but I can't see any. </p><p><br /></p><p>And if they thought it would have benefited from conservation, they might have made that offer to the submitter which he/you looks like they rejected if the offer was even made.</p><p><br /></p><p>I suspect it is just an odd-looking toning. And if the coin/slab has been in the wrong kind of environment it is just possible that some of what we're seeing is a kind of mold/mildew at the outer edge of possibility although there's no sign of it on the holder.</p><p><br /></p><p>Courses of action? Crack and clean in acetone and then maybe dip it yourself? Or, send it in to NGC for an evaluation for conservation.[/QUOTE]</p><p><br /></p>
[QUOTE="Publius2, post: 8313366, member: 105571"]More information, please. It's slabbed by NGC. Did it straight-grade? Your OP implies it did. Did it look this way when it was slabbed or did you buy it this way? If it turned in the holder since you bought it, how long was it in your possession before it started exhibiting this look? What environment has the coin/slab been in since you acquired it and how long have you had it? Now for rank speculation: It probably hasn't been in this slab earlier than 2008 when the Edge View was introduced. I doubt that NGC would have slabbed it, even in a details holder, if it had PVC contamination/damage. Yes, they make mistakes but that's not usually one of them. If the coin was damaged by PVC, I would expect to see some pitting but I can't see any. And if they thought it would have benefited from conservation, they might have made that offer to the submitter which he/you looks like they rejected if the offer was even made. I suspect it is just an odd-looking toning. And if the coin/slab has been in the wrong kind of environment it is just possible that some of what we're seeing is a kind of mold/mildew at the outer edge of possibility although there's no sign of it on the holder. Courses of action? Crack and clean in acetone and then maybe dip it yourself? Or, send it in to NGC for an evaluation for conservation.[/QUOTE]
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Green Gunk on Silver Coins (1921 SLQ) - What to Do?
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