Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. 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 Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *