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<p>[QUOTE=&quot;Insider, post: 3657356, member: 24314&quot;]Lehigh96, posted: &quot;Every coin has some level of toning/oxidation, so claiming that my rainbow toned coins are damaged while thinking that your seemingly untoned coins are not damaged is silly.&nbsp; [USER=112]@GDJMSP[/USER] espouses this all the time, and he is corrrect.&quot;</p><p><br /></p><p><span style="color: rgb(179, 0, 179)">Sorry, it is not clear to me from your post what is &quot;correct&quot; that Doug espouses all the time.&nbsp; Toned coins are damaged and Untoned coins are not?</span></p><p><br /></p><p>Furthermore, a patina can often provide a protective layer that actually inhibits further oxidation.&nbsp; [<span style="color: rgb(179, 0, 179)">I agree 100%.&nbsp; For example the Aluminum used on our naval vessels for signage is protected in this way.]</span>&nbsp; For example, the patina on your Chinese knife coins is actually a good thing.</p><p><br /></p><p>Lastly, the formation of rainbow toning on coins needs a sulfur laden source, such as a paper album, canvas bag, government packaging etc.&nbsp; Once the coin is removed from the toning source and inserted into TPG plastic, it can only tone further by exposure to Hydrogen Sulfide gas in the atmosphere.&nbsp; As long as you store your graded coins in a temperature controlled low humidity environment, you will not see any advancement of the toning in your lifetime.</p><p><br /></p><p>Btw, I know you are in college, what is your major?&nbsp; I graduated from Lehigh University with a <b><i><span style="color: rgb(179, 0, 0)">BS in Materials Science &amp; Engineering with a specialization in metallurgy/corrosion</span></i></b>.&quot;</p><p><br /></p><p><span style="color: rgb(179, 0, 179)">Then, it is a complete mystery to me how you can post as you are doing.&nbsp; Many folks with your background don&#039;t agree with you and consider toning to be damage.&nbsp; One, Mr. White is published.&nbsp; Perhaps you could read his opinions and refute them here.&nbsp; I&#039;m sure what you could write would be a &quot;Featured Post.&quot;</span></p><p><span style="color: rgb(179, 0, 179)"><br /></span></p><p><span style="color: rgb(179, 0, 179)">Maybe we can just agree that there are different stages of oxidation &quot;damage.&quot;&nbsp; Some of the stages up until the BLACK, ETCHED SURFACE (end stage) can be very attractive and add eye appeal and value to a coin for many folks.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></span>[/QUOTE]</p><p><br /></p>

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