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Hidden Art Could Be Revealed by New Terahertz Device
This 2008 article discusses how T-rays (terahertz radiation) "could let art historians see murals hidden beneath coats of plaster or paint in centuries-old buildings" and "could also illuminate penciled sketches under paintings on canvas without harming the artwork." Includes images. From the University of Michigan News Service.
http://www.ns.umich.edu/htdocs/releases/story.php?id=6300
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