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<p>[QUOTE=&quot;desertgem, post: 1770126, member: 15199&quot;]I visualize the flow from the strike to be from the center outward ( thinking that the dies are slightly conical to start with ) , so as the flow occurs , the surface should be almost homogeneous in alloy mix ( normal alloy mix or improper) over the surface of the coin as it is struck, so I do not see why that area should tone differentially compared to the rest ( proper or improper mix). I will have to get out a group of cents that are RB and see if that is a consistent fact ( the last area to turn brown) as I am not sure either way, although I have looked at thousands, it didn&#039;t stick in my mind one way or another. Sorry to cause confusion.</p><p>&nbsp;</p><p>I would understand why there could be variations in the subsurface metal crystallization such as the Cu-Ni mix of 5 cent coins ( thus the phenomena of Nic-a-Date), but it doesn&#039;t work on copper alloys.[/QUOTE]</p><p><br /></p>

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