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<p>[QUOTE=&quot;Topher, post: 223858, member: 8489&quot;]I&#039;m colourblind, although I can tell a silver coin from nickel, but I may have trouble telling &quot;whiteness&quot; between to silver coins.&nbsp; However, I did a Master&#039;s thesis using spectrographs in my research, so I&#039;m sure I could take a known .800 silver and a known .500 silver and see if they have different sonic properties.&nbsp; That should show up quite easily on a spectrograph, if there are differences.[/QUOTE]</p><p><br /></p>

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