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<p>[QUOTE=&quot;Oldhoopster, post: 2732597, member: 84179&quot;]As Idhair said, we can only speculate as to the old tarnish stain.&nbsp; I don&#039;t think it could be an alloy problem because the ingots are rolled out, so i would expect any inhomogeneities to be elongated, not circular in the center of the planchet.</p><p><br /></p><p>I don&#039;t know how you tell if the tarnish was on the planchet prior to minting.&nbsp; If the tarnish was sufficiently thick, it might leave a mark at the interface or there may be differences in metal flow between the black and silver regions, but you might need some SEM analysis to prove it.</p><p><br /></p><p>Like William of Occum, I think the best guess is the simplest.&nbsp; End roll toning seems to make the most sense.&nbsp; It seems reasonable to think that MW used rolls to assemble the sets, and who knows what kind of environment they were exposed to prior to opening.&nbsp; No way to be certain, but I think this is a reasonable explanation[/QUOTE]</p><p><br /></p>

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