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<p>[QUOTE=&quot;Collect89, post: 1351038, member: 15445&quot;]<b>L.a.s.e.r.</b></p><p><br /></p><p>When I was fresh out of college we literally used rocket engine technology to create metastable state plasma for high energy laser.&nbsp; A coin was never intentionally targeted but I&#039;m sure that the output would adversely affect a coin&#039;s luster. :devil:&nbsp; It was one heck of a laser pointer.</p><p><br /></p><p>Even our highly efficient, actively cooled mirrors had trouble because if they didn&#039;t reflect a tiny portion of the energy, they would quickly over-heat &amp; die.&nbsp; If targeted by the laser, I believe a proof coin with high reflectivity (without cameo) may have lasted about 1 nano second longer than a mint state coin.&nbsp; In any case, the coin &amp; whatever it was resting on would turn to gas quickly.</p><p><br /></p><p>The FDA and OSHA police laser pointers in the USA.&nbsp; I suspect that the OP&#039;s laser pointer has an output that is something below 2.5 milliwatts per square cm.&nbsp; That is just my SWAG.&nbsp; You could collect &amp; focus that power onto a very small area of a coin.&nbsp; Any energy not reflected would cause the temperature of the very small area to rise.&nbsp; You can see how a system could be engineered to locally heat-up (melt) hairlines on a proof coin’s reflective fields.&nbsp; Only the less reflective hairlines would have localized rise in temperature and the reflective fields would remain cooler.&nbsp; The result is that the hairlines would melt away.[/QUOTE]</p><p><br /></p>

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