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Quiz# 8 Natural or Artificial toning?
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<p>[QUOTE="GDJMSP, post: 4586089, member: 112"]Based on the comments in the thread there are at least a couple basic misconceptions. First, both silver and gold coins can and do get verdigris on them. No it does not happen as often as it does with copper coins, but it most definitely happens. Even gold coins with a fineness of 98.6% can and do get verdigris on them, so of course all 90% coins do as well.</p><p><br /></p><p>PVC residue is not always green ! Yes it is at times, but it can also be clear, whitish, tan, brown, and black - and pretty much all shades in between. And PVC residue is not always oily, sticky, slimy, or gooey - but it certainly can be. Sometimes it is even hard, crusty, or flaky.</p><p><br /></p><p>The color and consistency of PVC residue is determined by its age. When fresh and new it's almost crystal clear, nearly invisible, and oily or sticky at that point. As it ages color and consistency changes to those described above.</p><p><br /></p><p>And the color green - yes toning can be green. Just because you see green on a coin that doesn't mean the coin has verdigris or PVC residue on it ! It might be, but might doesn't mean it is ![/QUOTE]</p><p><br /></p>
[QUOTE="GDJMSP, post: 4586089, member: 112"]Based on the comments in the thread there are at least a couple basic misconceptions. First, both silver and gold coins can and do get verdigris on them. No it does not happen as often as it does with copper coins, but it most definitely happens. Even gold coins with a fineness of 98.6% can and do get verdigris on them, so of course all 90% coins do as well. PVC residue is not always green ! Yes it is at times, but it can also be clear, whitish, tan, brown, and black - and pretty much all shades in between. And PVC residue is not always oily, sticky, slimy, or gooey - but it certainly can be. Sometimes it is even hard, crusty, or flaky. The color and consistency of PVC residue is determined by its age. When fresh and new it's almost crystal clear, nearly invisible, and oily or sticky at that point. As it ages color and consistency changes to those described above. And the color green - yes toning can be green. Just because you see green on a coin that doesn't mean the coin has verdigris or PVC residue on it ! It might be, but might doesn't mean it is ![/QUOTE]
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Quiz# 8 Natural or Artificial toning?
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