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<p>[QUOTE=&quot;Lehigh96, post: 866416, member: 15309&quot;]The problem with that hypothesis is that the coins did not stay in that environment for very long.&nbsp; Soon after minting they are bagged up and shipped out.&nbsp; So unless the minting environment left a suflur rich residue on the struck coins prior to being moved, there would be no way that it could impart toning on the coin.&nbsp; I doubt very much that a sulfur rich residue ended up on the coins from the ambient environment of the minting rooms.&nbsp; But then again, I wasn&#039;t there to see the conditions or industrial set up of US mint in the 19th century.[/QUOTE]</p><p><br /></p>

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