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<p>[QUOTE=&quot;desertgem, post: 2213403, member: 15199&quot;]Rlm is in the right ball park, infrared is a very low resolution medium compared to higher visible spectrum or above. Perhaps high level IR cameras such as the&nbsp; astronomical&nbsp; telescopes in SPITZER or HUBBLE satellites, but since they operate at near zero degree K contrast, there is a lot of contrast. On earth where the difference would be so small due to the size of the date, and how fast it would warm to equality with the rest of the coin, I do not believe it is currently possible with consumer goods.</p><p><br /></p><p>Besides how to convince someone you really have a &#039;rare date&#039; determined by such a means?[/QUOTE]</p><p><br /></p>

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