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<p>[QUOTE=&quot;Insider, post: 2501915, member: 24314&quot;]This is an interesting topic.&nbsp; I have been posting this week about this on Collectors Universe (&quot;Black Rims on Morgans&quot;).&nbsp; Unfortunately, I have been locked out of any more comments <span style="color: #00b300">on that thread</span> to refute the posters who insist that corrosion is the same as toning - I claim that a PCGS graded dollar has a jet black corroded edge that is terminally damaged under the color!&nbsp; </p><p><br /></p><p>We often have a problem with the words we use to describe the things we see on coins.&nbsp; For example: &quot;Toning.&quot;</p><p><br /></p><p>As I understand it, <span style="color: #b300b3">toning</span> describes the film of colors that occur on a coin due to NATURAL chemical changes to its surface.&nbsp; These changes can be attractive or not.&nbsp; When they are not, we sometime hear the word &quot;tarnish&quot; used. </p><p><br /></p><p>Toning occurs in degrees.&nbsp; When it reaches the terminal stage, the surface becomes etched (damaged/ruined) under the relatively thick (no longer a &quot;film&quot;) black surface.&nbsp; This state is called corrosion or &quot;Environmental Damage&quot; to soften the bad news. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /></p><p><br /></p><p>There are some &quot;purists&quot; who claim that any toning on a coin damages its original surface.&nbsp; While this may be chemically and technically correct, most do not agree with this as can be seen in the coin market. </p><p><br /></p><p>Light toning can be removed w/o a trace.&nbsp; Many later stages can be &quot;fixed&quot; or at the least improved but we probably do not want to know how this is done. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie46" alt=":facepalm:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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