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<p>[QUOTE=&quot;calcol, post: 2707600, member: 77639&quot;]I&#039;ve always assumed that all copper will windup brown eventually unless it&#039;s coated to prevent reaction with gases. Apparently, it can take many decades in some cases as there are red coins from the 19th century.&nbsp; I don&#039;t know of a way to convert brown back to red in a undetectable manner, but maybe it&#039;s possible.&nbsp; I generally go for RB, but have a few BN&#039;s and one RD.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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