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<p>[QUOTE=&quot;dougsmit, post: 1695782, member: 19463&quot;]BTW, remember that it is necessary to overcome the fact that surfaces and cores are not always the same material when using a speed gun.&nbsp; If the coin was silver washed or hoarded with other silver coins, you might get a bad reading from the surface.&nbsp; How deep do the XRF units penetrate?&nbsp; Micron?&nbsp; This was found to be a real problem when studying silver coins produced on blanched flans where the surface would b significantly better silver than the core.&nbsp; That is why some workers drilled holes in coins to gain samples below the enriched layer.[/QUOTE]</p><p><br /></p>

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