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<p>[QUOTE=&quot;mikediamond, post: 2310546, member: 1859&quot;]We really don&#039;t know for sure, but there are a number of suspects.&nbsp; Planchets have a very thin film of oil; handle a bagful of bright, uncirculated cents and your fingers will become dirty.&nbsp; The dies can theoretically pick up and accumulate this film.&nbsp; Components of the die assembly are probably lubricated, and this could flow down toward the die face.&nbsp; Grime can accumulate in the guts of the press and this can fall out into the striking chamber, where it&#039;s later picked up by the dies.[/QUOTE]</p><p><br /></p>

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