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<p>[QUOTE=&quot;TypeCoin971793, post: 3209841, member: 78244&quot;]I soaked the coin in acetone, and this is how it turned out after brushing under flowing water. I saw no evidence of a glue being used to apply a patina.</p><p><br /></p><p>[ATTACH=full]833147[/ATTACH] [ATTACH=full]833148[/ATTACH] </p><p><br /></p><p>Under magnification, I see raised bumps around the SE part of the Guan character. I theorize that as these bumps formed as the iron reacted with its environment, the patina cracked and was able to flake off. I have read somewhere that that can happen, but I forget in what context. I saw the same phenomenon on an unquestionably genuine Yuan Feng iron 3-cash</p><p><br /></p><p>Hartill also marks the iron 3 cash as more common than tge bronze version.[/QUOTE]</p><p><br /></p>

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