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<p>[QUOTE=&quot;physics-fan3.14, post: 3172824, member: 19165&quot;]MS-70 is well known to turn copper coins blue. There have been quite a few coin doctors who took advantage of this, carefully applying small amounts of MS-70 to high UNC copper coins. Many collectors like the look of those coins, but TPGs have learned to call them Questionable Color. </p><p><br /></p><p>In your case, the psychedelic effect is very off-putting.</p><p><br /></p><p>But I have to ask, why were you trying to harshly treat that attractive looking circulated coin? I see a bit of green on it, which would be effectively and safely treated with acetone.[/QUOTE]</p><p><br /></p>

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