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<p>[QUOTE=&quot;Insider, post: 2391143, member: 24314&quot;]Actually you are both correct as it depends on the spot.&nbsp; In one &quot;study&quot; to get rid of them it was found that moisture from an air gun used during the slabbing process causes some of these spots to develop over time - even in an &quot;air-tight&quot; holder.&nbsp; Now, there are multiple filters in place.&nbsp; Also, pressure on the Mint caused them to release their findings on Mint-caused spots.[/QUOTE]</p><p><br /></p>

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