Since its founding in 1934, the science laboratory of London's National Gallery has thrown light - visible, infrared, X-ray and metaphorical - on hundreds of artworks, including rare paintings by Albrecht Duerer, Sandro Botticelli and Raphael. This has proved embarrassing as well as illuminating: some of the pieces in the gallery's collection have been uncovered as fakes.rnThe work of the gallery's conservation scientists is the subject of a major exhibition there this summer. Close Examination highlights the analyses of dozens of pictures dating from the fifteenth to the twentieth century, exposing instances of deception, modification and redemption.
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