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<p>[QUOTE=&quot;Oldhoopster, post: 3498057, member: 84179&quot;]It appears that there may be larger grains in the copper which could be an indication of an improper alloy, contamination, or an annealing issue.&nbsp; These could be localized to the fracture region or be throughout the planchet (I believe they are in the entire planchet, but no proof to support that).</p><p><br /></p><p>Please note, I am not a metallurgist nor am I familiar with a typical microstructure of this type of copper, but believe the large grains are an anomaly.&nbsp; I welcome additional comments or corrections from members with more experience in metallurgy.[/QUOTE]</p><p><br /></p>

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