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<p>[QUOTE=&quot;Electron John, post: 2618969, member: 84417&quot;]I was wondering if I could tell the difference between an older copper cent (1980 in this case, on left) and a newer copper-plated zinc cent (2001 on right) by x-ray imaging alone.&nbsp; Of course one could weigh them.&nbsp; So I took an x-ray image of the two and displayed the image as a pseudo color heat map so that more radiodense areas (denser or thicker areas) will appear red (see overlapping area) and radiolucent areas appear blue.&nbsp; With much fussing I was able to show a difference.&nbsp; The copper cent is more green.&nbsp; But it was surprising to me how similar they where.&nbsp; Although in hind sight copper and zinc are right next to each other on the periodic table so it shouldn&#039;t have been all that unexpected.&nbsp; Anyway I thought some of you may be interested in the image so here it is.[/QUOTE]</p><p><br /></p>

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