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<p>[QUOTE=&quot;Oldhoopster, post: 4635170, member: 84179&quot;]What I&#039;m reading in your post says that since lamination s are common in improperly alloyed metals and since there is a lamination on the OPs coin, it must be improperly mixed.&nbsp; And your supporting information is that an error expert has never seen a lamination on a roller marked coin?&nbsp; And the weight of that information is enough to tip the conclusions towards your side of the discussion? Is that correct, or did I miss something?</p><p><br /></p><p>C&#039;mon. At least I tried to back up my comments with some science and chemistry</p><p><br /></p><p>I don&#039;t understand why a coin with roller marks couldn&#039;t also have a lamination.&nbsp; The mechanism for the formation of laminations occurs during the ingot casting process. Entrapped gas or poorly mixed alloys.&nbsp; Wouldn&#039;t this be independent of the rolling process?</p><p><br /></p><p>Also, Could you please offer an explanation/hypothesis on how a lamination can cut across grain boundaries of dissimilar compositions yet show no evidence of following the grain boundary?&nbsp; It doesn&#039;t make sense for an unbonded area to be intragranular when&nbsp; the grain boundaries of dissimilar compositions would likely be the weakest point.&nbsp; And if the grain boundaries are strong enough so that the unbonded area is intragranular, how did the void that initiated the lamination form in the first place?[/QUOTE]</p><p><br /></p>

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