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<p>[QUOTE=&quot;ddddd, post: 6794066, member: 22377&quot;]Per PCGS:</p><p>&quot;Environmental damage includes such problems as corrosion, excessively dark toning and verdigris. Most of these problems arise from improper storage, either in a humid, warm, or extremely bright environment, or from burial in the ground or in the sea&quot;</p><p><br /></p><p><a href="https://www.pcgs.com/news/no-grade-coins-pt6" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.pcgs.com/news/no-grade-coins-pt6" rel="nofollow">https://www.pcgs.com/news/no-grade-coins-pt6</a></p><p><br /></p><p>So the linked examples aren&#039;t necessarily artificial (they could have used &quot;questionable color&quot; in that case). PCGS believed they were excessively dark or had other signs of improper storage.[/QUOTE]</p><p><br /></p>

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