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<p>[QUOTE=&quot;physics-fan3.14, post: 2942332, member: 19165&quot;]I&#039;ve seen this look before when someone tries to artificially tone a coin. The artificial toning is unstable, and will sometimes turn black. </p><p><br /></p><p>If it is genuine toning, then it is absolutely terminal. It is also ugly. </p><p><br /></p><p>I&#039;d try a rinse in acetone first to see if it is a substance on the coin that may come off. If that doesn&#039;t work, I&#039;d dip it. The worst that could happen is that you get a decent coin back - but I would not be surprised if the surfaces underneath are dull. This is a problem coin, and will always be a problem coin, so experiment and see what happens.[/QUOTE]</p><p><br /></p>

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