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<p>[QUOTE=&quot;Insider, post: 2398720, member: 24314&quot;]I&#039;m no chemist.&nbsp; I am going to change my terminology based on posts in this thread and some recent Internet research.</p><p><br /></p><p>I&#039;ve learned that Verdigris is a &quot;hard&quot; encrustation of various chemical compositions in shades of blue and green that forms on copper or brass due to oxidation.&nbsp; It is also called &quot;patina.&quot;&nbsp; So from now on, when I see the soft, green crud forming on the surface of copper (see Post#280) I will just call it &quot;crud&quot; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie50" alt=":happy:" unselectable="on" unselectable="on" /></p><p><br /></p><p>This appears to be one more case where the old teachings were incorrect and the younger, more informed numismatists corrected the record.</p><p>Thanks for the education <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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