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<p>[QUOTE=&quot;Lehigh96, post: 3657230, member: 15309&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.</p><p><br /></p><p>Furthermore, a patina can often provide a protective layer that actually inhibits further oxidation.&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 BS in Materials Science &amp; Engineering with a specialization in metallurgy/corrosion.[/QUOTE]</p><p><br /></p>

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