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<p>[QUOTE=&quot;Insider, post: 2657191, member: 24314&quot;]<b>Who could disagree with that?</b>&nbsp; However, it is not practical.</p><p><br /></p><p>In my limited experience, at least 20% (I&#039;m very being conservative here) of coins in major TPGS slabs have &quot;Chemically Altered Surfaces&quot; that are either passed as &quot;market acceptable&quot; or get through undetected!&nbsp; Many of these turn color in the slab over time making them more obvious.&nbsp; The percentage I posted above <span style="color: #b30000">does not include</span> any slabbed coins with PVC film, dirt, or built up green crud that should add another 30% (again an extremely conservative estimate). </p><p><br /></p><p>One professional I know who has worked at different TPGS&#039;s has suggested that all coins be conserved before slabbing to remove any surface contaminants. This had legal drawbacks and was not adopted.&nbsp; For example, if I sent an original, gray toned dirty 1799 dollar and the dirt around the devices was removed, in most cases, the surface under the dirt would not have toned the same color and the coin would loose lots of its eye appeal and perhaps some of its retail value.&nbsp; Can you say possible legal problem <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie79" alt=":rage:" unselectable="on" unselectable="on" />!</p><p><br /></p><p>Fortunately or unfortunately this has never been done; yet the seed was planted and he started NCS at NGC.[/QUOTE]</p><p><br /></p>

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