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<p>[QUOTE=&quot;EyeEatWheaties, post: 1162883, member: 26972&quot;]I have heard and understood that copper will turn in the slab.&nbsp; I know the slabs are not perfectly air-tite - however is there really any reason they aren&#039;t ? ..&nbsp; &nbsp; I also understand/believe that the cupric oxidation starts from the last day the planchet was polished and that it is a chain reaction&nbsp;&nbsp; I believe, coins that barely make the red designation, will most certainly be red brown quicker due to oxidized copper continuing to feed on itself.&nbsp; There is also the consideration of microscopic impurities in the copper, incomplete mixing of the alloy, residues from the striking and subsequent handling creating reactions as time goes on.&nbsp;&nbsp; </p><p><br /></p><p>I wonder what the relative humidity is in the area where they encapsulate/grade? </p><p>Is it monitored?&nbsp; Doubt it.&nbsp;&nbsp; </p><p>Anywhere on the submission form to check off on Rainy day or sunny day encapsulation?</p><p><br /></p><p>What is the volume of air with in the slab?&nbsp; </p><p>Does the difference of 70 and 90F speed up the reaction between CU and O2 </p><p>Is outside air of the slab supposed to be a 0 atmospheres?</p><p>Does altitude play a factor in oxidation process? </p><p>What about sunlight, does that speed up the reaction?</p><p>What is the optimum RH for storage?</p><p>Why isn&#039;t a small amount of desiccant at minimum in the slab?</p><p>Why don&#039;t graders wear gloves?</p><p>Why don&#039;t they wear masks?</p><p>Why isn&#039;t there an acceptable treatment process of the coin prior to encapsulation?</p><p><br /></p><p>Why don&#039;t I know the answers to any of these questions?&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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