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<p>[QUOTE=&quot;Insider, post: 8214090, member: 24314&quot;]True milk spots have been on our coin since the 1950&#039;s.&nbsp; I never herd the term until sometime in the 1970&#039;s.&nbsp; I thought it was common knowledge that the Mint was responsible for the spots.&nbsp; The whitish stains and spots seen since the start of the SE program are probably caused by chemicals used at the mint also.&nbsp; </p><p><br /></p><p>Now, we all should know that coins develop spots after being slabbed as &quot;perfect.&quot;&nbsp; That is why the TPGS dropped their guarantees.&nbsp; Who knows the cause of each of them; however, <b>I am 100% sure that in <i><span style="color: #b30000">many</span></i> cases it is the compressed air. </b> </p><p>Additionally, most of them ARE NOT caused by impurities in the planchet.&nbsp; Spots caused by impurities on the coin&#039;s surface are easy to resolve.[/QUOTE]</p><p><br /></p>

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