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<p>[QUOTE=&quot;Conder101, post: 3261377, member: 66&quot;]Wasn&#039;t sarcasm, just a statement of fact.&nbsp; The other methods all have shortcomings and can be fooled.&nbsp; The scratch test only test the outermost surface of the coin unless you cut DEEPLY into the coin.&nbsp; XRF guns test more deeply but are still pretty much just a surface test and can be fooled by thick plating.&nbsp; There are more high powered machines that can penetrate deeper but try usually don&#039;t test all the way through and are not readily available.&nbsp; Specific gravity&nbsp; is good when done carefully , but can&#039;t tell you everything because proper selection of alloys can provide the result desired even though the alloy is wrong.&nbsp; I don&#039;t know enough about ultrasonic testing to specify its shortcomings but I&#039;m sure they exist.&nbsp; But melting it down and then conducting a proper assay by a trained person is the only way to be absolutely sure of the composition.[/QUOTE]</p><p><br /></p>

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