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<p>[QUOTE=&quot;Insider, post: 25373311, member: 24314&quot;]Thanks for the chemistry lesson.&nbsp; </p><p><br /></p><p>As far as any tiny scratches you see at <b>50X</b>: The work is done using a microscope, proprietary chemicals, and a toothpick.&nbsp; The chemicals do most of the job but theoretically it would be possible to scratch the coin&#039;s surface.</p><p><br /></p><p>Note that there are tiny scratches on the surface where nothing was done.&nbsp; <b><font size="5"><span style="color: #b30000">Best of all</span></font></b>, no one examining the finished conservation using <b>20X+</b> would have a clue that I &quot;cleaned&quot; the coin.&nbsp;&nbsp; </p><p><br /></p><p>PS I shall try to soak one of these green crusted coins in a basic bath as you suggested![/QUOTE]</p><p><br /></p>

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