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<p>[QUOTE=&quot;-jeffB, post: 2487164, member: 27832&quot;]If it&#039;s an impurity in the planchet, an acetone soak will have no effect.</p><p><br /></p><p>If it&#039;s a reactive substance on the surface of the coin, acetone <i>might</i> remove it, exposing surface damage underneath. It&#039;s hard for me to imagine, though, that doing so would leave the coin less desirable overall. (If the market preferred ink-marks to surface damage, people would be using markers to cover damage.)</p><p><br /></p><p>I don&#039;t think any of us are proposing to remove the mark &quot;at any cost&quot; using aggressive treatments. Acetone is cheap, easy, and stands a good chance of helping; if it doesn&#039;t, you&#039;re no worse off.[/QUOTE]</p><p><br /></p>

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