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<p>[QUOTE=&quot;Oldhoopster, post: 4637797, member: 84179&quot;]Although lamentations are associated with improper mixing, they can also occur due to gas bubbles and both are independent events.&nbsp; How many laminations are due to mixing and how many are due to gas bubbles? Don&#039;t know, but in glass melts, bubbles are more common than unmixed, partially melted material.&nbsp; Is this different for metals? Maybe, but I would be surprised if it was significantly different.</p><p><br /></p><p>This is my explanation of why I believe it cannot be poorly mixed and I&#039;ve offered some science that can be checked.&nbsp; I was hoping that any discussion would involve something more than anecdotal observations and general statements saying &quot;laminations are found in poorly mixed metals, this coin has laminations, therefore it must be a poorly mixed alloy&quot;.&nbsp; While those types of observations can be valuable, when they don&#039;t support some of the basic science explanations, I have to question them. </p><p><br /></p><p>I don&#039;t have a solid explanation of the dirty roller theory and I have stated that previously.&nbsp; I do believe it&#039;s possible for oil/lubrication to be pressed into the surface at shallow depths (I believe [USER=1859]@mikediamond[/USER] proposed something like this) and then tone/stain over time, but can offer no hard facts or proof.</p><p><br /></p><p>I guess we will have to agree to disagree.&nbsp; The theories/explanations are posted for others to read, question, and draw their own conclusions.&nbsp; Thanks for the discussion. I had originally glossed over this thread, but your comments got me thinking about it.[/QUOTE]</p><p><br /></p>

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