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<p>[QUOTE=&quot;physics-fan3.14, post: 26339342, member: 19165&quot;]It honestly depends on what the staining is, what caused it, and how deeply it has penetrated the surface. </p><p><br /></p><p>NGC will not do anything to cause further harm, but if there is a substance present that is causing harm they will remove it and stabilize the coin. </p><p><br /></p><p>They make no guarantee that the coin will receive a straight grade - the damage already done may just make a details coin... but the professional conservation gives you the peace of mind that no further damage will occur. It is very possible that it will come back with a Details grade... I understand that you don&#039;t want that, but if there are surface problems they have to disclose that. </p><p><br /></p><p>I highly recommend it. I&#039;ve only used their conservation services a couple of times and I&#039;ve been highly pleased (on my particular coins there was no underlying damage so they received straight grades).[/QUOTE]</p><p><br /></p>

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