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<p>[QUOTE=&quot;Insider, post: 2300975, member: 24314&quot;]That is what the experts think.&nbsp; Planchet preparation (possibly old chemicals or poor neutralization).&nbsp; There is another possibility. Some spots may be caused if the compressed air used to blow off the coin and slab parts is contaminated. </p><p>&nbsp;</p><p><br /></p><p><br /></p><p>Milk spots or any other spots or unsightly stains WILL LOWER THE GRADE</p><p><br /></p><p><br /></p><p><br /></p><p>All major grading services offered a guarantee at one time.&nbsp; I know for sure that there is no guarantee for Silver Eagles that develop spots.&nbsp; I believe the same goes for copper cents.&nbsp; Check on this at the TPGS.</p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>The term &quot;Milk Spot&quot; as &quot;coined&quot; decades ago DID refer to ANY white spots commonly seen on silver coins DECADES before there was anything called a Silver Eagle produced.&nbsp; Milk spots seem to EVENTUALLY penetrate into the surface and become harder to remove.&nbsp; In most cases it is impossible but conservation techniques have been developed that can lighten them and make them less visible.&nbsp; I have seen it done.&nbsp; Nevertheless, it&#039;s best to leave them alone.&nbsp;&nbsp; </p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>The TPGS do not spot coins UNLESS my theory of compressor contamination may be accurate in some cases.&nbsp; Perhaps the original submitter or one of the grader coughed on the coin too.&nbsp; Anyway, it is a provable fact that improperly neutralized coins (after a dip to make them bright) look great at the service but many can become unsightly some time after slabbing.</p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>As they should.&nbsp; Why quibble.&nbsp; it&#039;s the same picky thing as loss of luster.&nbsp; Who cares what caused it...it&#039;s lost.&nbsp; Who cares what caused it...it&#039;s a white spot!&nbsp; Only important thing about stains and spots is to know (most of the time) which can be removed and which cannot!</p><p><br /></p><p><br /></p><p><br /></p><p>YES, then it is a white stain.&nbsp; The white marks on Eagles &quot;jump out&quot; under fluorescent light.&nbsp; </p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>True but the accepted &quot;name&quot; for decades is a MILK SPOT.</p><p><br /></p><p><br /></p><p><br /></p><p>Absolutely true!</p><p><br /></p><p><br /></p><p>Thanks for reading my opinions as posting this is more fun than actually working <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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