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<p>[QUOTE=&quot;GDJMSP, post: 20571762, member: 112&quot;]And that&#039;s kind of my point. Verdigris is not active corrosion. Verdigris is the result of active corrosion. In other words, verdigris only becomes visible after the corrosion has already occurred and is over done with. Once verdigris forms, the harm has already been done.</p><p><br /></p><p>Verdigris itself does not harm the coin. It can sit there on the coin for decades and never get any worse or cause any additional harm. </p><p><br /></p><p>Now yes, of course it is possible that a coin with verdigris on it could still be corroding. But the corrosion would be being caused by excessive moisture. Corrosion is not caused by verdigris. It is also equally possible that on a coin with verdigris on it, the corrosion has completely stopped and is no longer occurring at all.</p><p><br /></p><p>Splitting hairs ? Perhaps, but it&#039;s a very important hair that needs to be split.</p><p><br /></p><p>To my knowledge, your product Thad is the only product in existence that will &quot;safely&quot; remove verdigris. But the TPGs won&#039;t use it, or so they claim, because of the protective coating it leaves behind on the coin. </p><p><br /></p><p>That said, it would not surprise me in the least that they would use it, and then simply rinse the coin again to remove the coating. Of course if they did do that, then the harm already done may well become visible, and if it does, they may be forced to lower the grade. So maybe, just maybe, they wouldn&#039;t want to do that.[/QUOTE]</p><p><br /></p>

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