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<p>[QUOTE=&quot;Oldhoopster, post: 3559598, member: 84179&quot;]Not trying to be argumentative (Ok, maybe a little<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />) but I’ve used lots of analytical data including XRF. It’s important to have a basic understanding of how these methods work, so you can specify the correct test and know how the limitations could affect your data.&nbsp; There are some guys on CT that know a heck of a lot more about material analysis and can explain it a lot better, but I feel my previous posts provide a good general overview of why XRF isn’t a good analytical method for verifying brass plated cents.&nbsp; XRF works really well, unfortunately this would be one of the rare cases where it doesn&#039;t</p><p><br /></p><p>Also, don’t assume that people at the TPG are experts on analytical techniques.&nbsp; I work with cross functional engineering teams and if someone doesn’t regularly work with the data, they don’t always know about the limitation.&nbsp; It isn’t unreasonable to think that ANACS could have just done a point and shoot with a handheld XRF, saw Zn, and said it’s brass, not fully understanding where the Zn is coming from.</p><p><br /></p><p>All that being said, I still think [USER=92083]@JCro57[/USER]&nbsp; coin is brass plated.&nbsp; I’m just uncomfortable with the verification. </p><p><br /></p><p>Hope that explanation helps[/QUOTE]</p><p><br /></p>

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