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<p>[QUOTE=&quot;iGradeMS70, post: 1312615, member: 29109&quot;]The browning is caused by oxidation. Back in the day, there was almost no way to avoid this oxidation when storing your coins. Even though the coin may appear to be fully &quot;red&quot; in color, chances are that it has miniscule brown spotting on it&#039;s surface. This spotting is enough for it to be refered to as a &quot;red-brown&quot; coin by most TPG&#039;s. &quot;RD&quot; coins are far more desirable than &quot;RB&quot; coins.</p><p><br /></p><p>-Brian[/QUOTE]</p><p><br /></p>

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