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<p>[QUOTE=&quot;messydesk, post: 24634965, member: 1765&quot;]Metal flows from the center outward when the coin is struck.&nbsp; The peripheral lettering interrupts the flow a bit.&nbsp; As a result, the fields just beyond it have less flow and end up toning differently.&nbsp; The presence of a collar die seems to make it more pronounced.&nbsp; I can&#039;t explain beyond that.&nbsp; Guessing that more flow means a more &quot;raw&quot; surface for toning, while less means that whatever was on the surface at time of striking is now more embedded in the metal, making it resistant to toning.&nbsp; Planchet preparation would also come into play, then.&nbsp; A bright, scrubbed planchet immediately struck might tone without developing pull-away toning.[/QUOTE]</p><p><br /></p>

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