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<p>[QUOTE=&quot;Conder101, post: 1802722, member: 66&quot;]The laser would be selectively focused on the verdigris and could vaporize it if properly tuned.&nbsp; It would not affect the patina on the rest of the coin because the laser would never be on those areas.&nbsp; But the ares where the verdigris is removed should NOT show the same patina.&nbsp; Verdigris eats into the surface of the metal, if you remove the verdigris there would be either bare virgin metal, or metal &quot;scorched/discolored&quot; by the laser.</p><p><br /></p><p>I would imagine the treatment works by tuning the laser to a frequency that the verdigris absorbs strongly, and which the metal does not.&nbsp; When the laser is shown on the verdigris it absorbs the energy and vaporizes.&nbsp; The heat of vaporization may discolor the underlying metal.[/QUOTE]</p><p><br /></p>

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