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<p>[QUOTE=&quot;iPen, post: 3677624, member: 69760&quot;]For bronze coins, perhaps one can take the average or median composition of such coins, create a sample of that alloy, measure the color, and use that as the basis for the color spectrum from which ancient bronze coins would deviate from. One tool that could be used for this is an XRF Analyzer in determining the coin&#039;s composition. Furthermore, perhaps the RGB values for many of the same alloys already exist in some database, which can be used as a reference when the coin&#039;s alloy matches what&#039;s in the database.</p><p><br /></p><p>Heavy patina coins with gray tones would mostly be measured on the black-white scale. Any hints of other colors would appear on the color spectrum (however minute). All of this would be measured by computer - automatically and quickly.</p><p><br /></p><p>But yeah, I could see how my grading criteria would mostly be for modern (specifically non-Ancient) coins due to the relative complexity of ancient coins to moderns.[/QUOTE]</p><p><br /></p>

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