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<p>[QUOTE=&quot;Oldhoopster, post: 4894663, member: 84179&quot;]The problem you&#039;re going to run into is getting analytical data to support your claims.&nbsp; XRF uses an X-Ray beam that penetrates below the surface up to 100 microns depending on the energy source and material.&nbsp; The Copper plating is only approx 8 microns thick, so when the results show Zn, is it zinc that&#039;s in the plating, or zinc from the core???&nbsp; I believe there may be lab instruments that can use a very shallow angle, but that&#039;s not something your going to easily find and the analysis would be expensive.</p><p><br /></p><p>Color is too subjective to be of any use.&nbsp; I read about brass plating in the early 80s and pulled a few yellow tinted coins from circulation at the time that I&#039;m absolutely positive are brass plated, but I have no proof.&nbsp; Copper is a very reactive metal, and environmental toning can easily occur.&nbsp; Without analytical data, color is just an opinion, and you know what they say about opinions.</p><p><br /></p><p>BTW: The color of your coins doesn&#039;t&nbsp; look like brass plating.[/QUOTE]</p><p><br /></p>

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