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<p>[QUOTE=&quot;mithril21, post: 3468125, member: 102153&quot;]What was the analysis area in comparison to the size of the rolled in foreign material? I assume it would encompass a larger area then just the foreign metal, so you are combining the chemistries of the foreign metal and the coin into one analysis which is then weighted to 100%. Also, XRF is only a surface chemistry. I would expect there to be oxygen present due to oxidation, but I do not believe that oxygen is detectable on the XRF and it was not included in the analysis report.</p><p><br /></p><p>With SEM/EDS, you can zoom in and analyze only the foreign metal, so that will give you a more accurate chemical analysis.[/QUOTE]</p><p><br /></p>

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