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<p>[QUOTE=&quot;GDJMSP, post: 1215925, member: 112&quot;]Yeah, but there are no hard and fast rules Thad. There are examples of coins that are every bit as blue as any ever treated with MS70, and those coins were blue long before MS70 (or other products like it) were ever even invented. So it can happen.</p><p><br /></p><p>But I&#039;ll grant you that in the last 10 years or so blue copper has become a lot more common than it ever was before. And I have no doubt whatsoever that it is due to MS70 being used. And I say that it has been approx 10 years because Greg Marguli (on the NGC forum) is the first person that I can ever recall writing about MS70 turning copper blue. And that was about 10 years ago. And I can also remember that at first a lot of people tried to argue with him and claimed that it wasn&#039;t true. But it is true, the stuff turns copper blue.[/QUOTE]</p><p><br /></p>

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