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<p>[QUOTE=&quot;ddddd, post: 13871640, member: 22377&quot;]Artificial and natural are hard to definitively prove and lead to the intent question we see in this thread.</p><p>Another way to look at the issue is market acceptable vs questionable. You eliminate intent and go with what is generally accepted by the market (usually meaning the TPGs). Toning that is consistent with what is found in album, bags, envelopes, cardboard (tab toners), etc is considered fine. Toning that looks like someone gassed/cooked the coin or applied some chemicals is not. Then there are the liner cases that even the TPGs don&#039;t agree on (think something like the blue/purple cents that may or may not be caused by MS 70 being applied)-that can be another long thread/debate. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie7" alt=":p" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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