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<p>[QUOTE=&quot;GDJMSP, post: 3967028, member: 112&quot;]Yeah the bottle says that. And from a certain perspective it is safe to use on copper - meaning it will not remove or damage luster. But it absolutely will turn the copper coins purple or blue. It&#039;s up to you to decide whether or not that&#039;s &quot;not safe&quot;. </p><p><br /></p><p>And you should also be aware that a whole lot of people use MS70 - on copper - specifically BECAUSE it turns the coins purple and blue ! </p><p><br /></p><p>Ya see, copper often tones those colors quite naturally. And when it does, a lot of people will pay sometimes ridiculous premiums for them. And the TPGs have been known to quite often slab the copper coins treated with MS70 because it&#039;s pretty dang difficult to tell natural from AT.</p><p><br /></p><p><br /></p><p><br /></p><p>Your question is more complicated than it may appear. I say that for a couple of reasons, mainly because it&#039;s really three different questions.</p><p><br /></p><p>Question 1 would be - can a TPG tell if MS70 has been used, and used correctly, on a coin ?</p><p>Answer - no. </p><p><br /></p><p>Question 2 would be - if you remove PVC from a coin, will that coin cleanly grade ?</p><p>Answer - maybe. That&#039;s because sometimes PVC residue can cause harm to the coin, harm that cannot be reversed by removing the PVC residue. And it would be that harm done that prevents the coins from getting a clean grade.</p><p><br /></p><p>However, if the PVC residue has not been there long enough, and it is removed correctly, then the coin may not have been harmed and it will get a clean grade.</p><p><br /></p><p>Question 3 would be - should MS70 be used to remove PVC residue ?</p><p>Answer - no. But the answer is no because - there are better things to use to remove PVC residue, one of which is acetone - not because using MS70 will harm the coin.[/QUOTE]</p><p><br /></p>

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