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<p>[QUOTE=&quot;Oldhoopster, post: 3156937, member: 84179&quot;]Assume you&#039;re talking about the copper plating having some zinc in it.</p><p><br /></p><p>During early zinc cent production, there was a problem with zinc blanks coming loose in the plating bath and dissolving into the solution.&nbsp; Depending on how much zinc was dissolved, the plating could be considered brass instead of copper.&nbsp; However, you need to do a chemical analysis to show that there is zinc in the copper.&nbsp; First non destructive tests like XRF (with lab grade equipment) or SEM/EDS aren&#039;t cheap.&nbsp; In addition, these tests penetrate slightly below the surface.&nbsp; Usually, this isn&#039;t a problem, but the plated layers are very thin and directly underneath is lots of zinc, so if you get a reading of 10% Zn, is that from the coating or are you starting to pick up the Zn core?</p><p><br /></p><p>FWIW: I don&#039;t think yours is brass, I have some that are a lot more yellowish that I picked from change in the 80&#039;s.&nbsp; I&#039;m certain they&#039;re brass (I&#039;ve spent my career working in Material Science/Engineering), but without analytical data it&#039;s just my opinion and color alone isn&#039;t a reliable indicator.[/QUOTE]</p><p><br /></p>

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