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<p>[QUOTE=&quot;BadThad, post: 870714, member: 17261&quot;]First off...</p><p>&nbsp;</p><p>There&#039;s so much misinformation and folklore surrounding verdigris it just amazes me. I really can&#039;t wait to finish my book to teach people the facts about verdigris. In the mean time, I recommend reading the <u>chemical composition</u> definition of verdigris that I&#039;ve posted on wikipedia (from my book):</p><p>&nbsp;</p><p><a href="http://en.wikipedia.org/wiki/Verdigris" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Verdigris" rel="nofollow">http://en.wikipedia.org/wiki/Verdigris</a></p><p>&nbsp;</p><p>This coin HAS mixed verdigris. Some of the light to moderate. may be removed, but the heavy verdigris probably cannot be conserved without: a) chemical surface damage b) leaving behind obviously cleaned surfaces below the verdigris c) surface copper removal (by the verdigris). What you find under the heavy verdigris will most likely not be pleasing. The thickness is such that a lot of copper has been pulled from the surface.</p><p>&nbsp;</p><p>Any verdigris conservation project should ALWAYS start by following what I call the &quot;Polarity Ladder&quot;. At minimum, this will prepare the surface for more advanced conservation techniques. Soak the coin in the following solvents, in order, for an hour or two (each side if affected):</p><p>&nbsp;</p><p>1) deionized (or distilled) water</p><p>2) acetone</p><p>3) xylene</p><p>&nbsp;</p><p>If no progress is made, reverse the order, go back to acetone and then water.</p><p>&nbsp;</p><p>If these steps do not satisfy you, it&#039;s time to make a decision on trying more advanced techniques.[/QUOTE]</p><p><br /></p>

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