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<p>[QUOTE=&quot;ValpoBeginner, post: 2733337, member: 77066&quot;]Perhaps this article will help those with the science issues as it relates to numismatics.</p><p><br /></p><p>Toning Often a Matter of&nbsp; Eye Appeal</p><p>By F. Michael Fazzari, Numismatic News</p><p>July 31, 2013</p><p><br /></p><p><a href="http://numismaster.com/ta/numis/Article.jsp?ad=article&amp;ArticleId=27085" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://numismaster.com/ta/numis/Article.jsp?ad=article&amp;ArticleId=27085" rel="nofollow">http://numismaster.com/ta/numis/Article.jsp?ad=article&amp;ArticleId=27085</a></p><p><br /></p><p>&quot;I teach that attractive oxidation is called “toning” and unattractive oxidation is called “tarnish.” Toned coins are desired by many collectors, while tarnished coins are less desirable.&quot;</p><p><br /></p><p>&quot;Many people view toning as the destruction of a coin’s surface. Who can argue with that? That’s exactly what oxidation does. When it becomes too advanced (black or dark in color), the original surface of a coin is actually <b>corroded away.</b> Lighter oxidation can be professionally removed without a trace, even when the surface is viewed using a stereo microscope. Perhaps purists will respond that damage will be seen using much higher powers of magnification and to that I must agree. In which case, no vintage coin is 100 percent original so let’s keep this discussion relevant to normal magnification.&quot;</p><p><br /></p><p>This was not my source in explaining the science. Actually it was from a book I read about 5 or 6 years ago.... but maybe this guy explains it better.&nbsp; I didn&#039;t mean to upset any of the purists who think &quot;bright white is the only right&quot;.&nbsp; But the consumer collectors and grading companies are sure taking control of the market majority by&nbsp; buying and selling toner coins.[/QUOTE]</p><p><br /></p>

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