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<p>[QUOTE=&quot;SuperDave, post: 2627572, member: 1892&quot;]Two factors:</p><p><br /></p><p>1) Physical surface irregularity and porosity. This is best evidenced here by the 1839, which plainly shows the surface etching common to long burial in acidic soil. In fact, I&#039;d go so far as to suggest this one might have been deliberately darkened to hide the cleaning it received - note the swirls of lighter color on the reverse where the artificial darkening didn&#039;t &quot;take.&quot;</p><p><br /></p><p>2) The combination of &quot;reasonable&quot; or &quot;lighter&quot; color with much darker areas on the same coin. The 1836 is the best example - it&#039;s unreasonable to expect surface areas as dark as it shows in places in conjunction with the center areas being so close to &quot;appropriate&quot; color. A reasonably expert evaluator won&#039;t think nature did that. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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