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<p>[QUOTE=&quot;kanga, post: 376989, member: 9270&quot;]Here&#039;s my understanding.</p><p>PVC damages coins significantly.</p><p>Verdigris is damage that has already occurred.</p><p>As such, both <u>lower the value</u> of a coin.</p><p>It&#039;s just a matter of degree</p><p>- PVC = lots, if left to continue its work (hence an acetone/distilled water bath)</p><p>- Verdigris = Not as much AND ceases to continue its work if the coin is removed from contact with air and humidity.</p><p>&nbsp;</p><p>Look at the reverse on the 1864 Small Motto in this thread:</p><p>&nbsp;</p><p><a href="http://www.cointalk.org/showthread.php?t=37467" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.cointalk.org/showthread.php?t=37467" rel="nofollow">http://www.cointalk.org/showthread.php?t=37467</a></p><p>&nbsp;</p><p>That&#039;s verdigris. Looks dry and crusty. It can be removed but you would then see damage underneath. It&#039;s just that since it&#039;s slabbed the progression of the damage has been halted.</p><p>&nbsp;</p><p>PVC damage will look moist and gooey. And it won&#039;t cease just because it gets sealed.</p><p>Note that I didn&#039;t say slabbed because I don&#039;t think a TPG would slab it <u>as is</u> with PVC present.</p><p>ANACS would after being cleaned but would note the problem.</p><p>NCS would, but without a grade.</p><p>&nbsp;</p><p>And PVC is sneaky.</p><p>It&#039;s mostly associated with copper coins.</p><p>But it can also affect gold and silver coins.</p><p>Not the gold and silver metal, but the copper that they are alloyed with resulting in a pitted coin.</p><p>&nbsp;</p><p>I&#039;ve got such a coin in with NCS right now.</p><p>I&#039;m hoping it was caught early enough that NGC will slab it with no DETAILS notation.[/QUOTE]</p><p><br /></p>

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