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<p>[QUOTE=&quot;davidh, post: 490385, member: 15062&quot;]&quot;Red&quot; is used to describe the color of copper coins.&nbsp; The color of raw copper is considered to be &quot;red&quot;.&nbsp; As it tones in response to atmospheric gasses, it tends to turn brown.&nbsp; As this toning usually occurs unevenly over the coin&#039;s surface, part of it is still red while the rest is brown.&nbsp; This condition results in a description of red-brown, or RB.&nbsp; A fully toned (brown) coin is B.[/QUOTE]</p><p><br /></p>

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