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<p>[QUOTE=&quot;desertgem, post: 2990802, member: 15199&quot;]The problem is that there are substances that can chemically break sulfur-copper bonds. The problem is that they will react more on the purer copper coin than on the bound copper - sulfur. Many older coins bear signs ( small pits) that they have been treated, probably with acid/thio dip or worse. After which they were probably bright pink, but if you wait 30-50 years they might retone enough to pass (Brown).</p><p><br /></p><p>When a TPG guarantees they can remove ALL such spots, no matter the size, or money back. I might buy the aspect they have a secret formula no one has known but them. I think lasers have a better chance than chemicals myself.[/QUOTE]</p><p><br /></p>

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