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<p>[QUOTE=&quot;Oldhoopster, post: 3559429, member: 84179&quot;]While XRF is considered a surface analysis, the XRay penetration depth is greater than the approx. 8 micron thick copper plating.&nbsp; This will result in the instrument detecting energy from Zn in the core.&nbsp; In order to show that the plating is brass, you need to show that Zn is present.&nbsp; There is no way to differentiate if the detected Zn is in the Cu plating or if it’s from the core.&nbsp; <u>That’s the problem</u>.&nbsp; So you&#039;re basically stuck on a subjective color observation to determine if it&#039;s brass.[/QUOTE]</p><p><br /></p>

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