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<p>[QUOTE=&quot;GDJMSP, post: 4084739, member: 112&quot;]I agree with your last sentence, but migrate through the metal ? The only time that can happen is when the metal is in molten form - in other words before it even becomes metal in the normal sense of the word. Once it does harden and become metal, any impurities are fixed in place. And the vast majority of any impurities are going to be scattered about throughout the entire thickness of the metal in individual molecules, with maybe a few small clumps of molecules here and there. As the strip is rolled out to planchet thickness, yeah some of those clumps of impurities may become exposed on the surface. But when the finesess is .999 or .9999 - there&#039;s going to be very dang few of them ! And the odds of a single clump, let alone several clumps, just happening to end up on the surface by chance - are astronomical because of the fineness. But yeah, it can happen. </p><p><br /></p><p>And once the rolling is done and the planchets are cut, visualize the planchet as looking this when viewed from the side, with that small dot in the middle being a clump of impurities - </p><p><br /></p><p>______________________</p><p><br /></p><p>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; <font size="7">.</font></p><p>______________________</p><p><br /></p><p>You have 2 surfaces, top and bottom, and for copper spots or milk spots to become visible, they absolutely have to be right at the surface of either the top or the bottom. So given the odds I mentioned above, you then have to also consider the odds of a clump or clumps of impurities being right on the surface in that entire thickness. Granted if they are on the surface they can have been enlarged by the rolling. But they first have to be there.</p><p><br /></p><p>Given all of this, you begin to see how unlikely it is for those clumps to be right on the surface, nonetheless, it cannot be denied that it happens for the spots do appear, and way more often than they should ! </p><p><br /></p><p>There&#039;s one very obvious possibility, the fineness is not what is claimed in many cases. That said, all tests, and there are tests, seem to indicate that it is what is claimed.</p><p><br /></p><p><br /></p><p><br /></p><p>I guess that depends on how you&#039;re defining splatters. But the word itself makes me think of something being deposited on the surface of the planchet or coin. But if that were the case, then dipping could and would remove them. But since dipping doesn&#039;t remove them, it kind of dictates that they are not splatters being deposited on the surface after planchet or coin formation.[/QUOTE]</p><p><br /></p>

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