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66Water sensitivity of modern oil paint filmsAviva Burnstock1, Judith Lee1, Klaas Jan van den Berg3, Bronwyn Ormsby21 Courtauld Institute of Art, Department of Conservation & Technology,Somerset House, London WC2R 0RN, UK2 Tate Britain, Millbank, London, UK, SW1P 4RG3 RCE Cultural Heritage Agency of the Netherlands, 1071 ZC Amsterdam, The [email protected] Samples of 20th Century oil paints made by Winsor & Newton and a painting by Ethel Walker dated c.1930 made using paints from the same manufacturer were analysed to investigate the cause of water sensitivity. Samples of water sensitive surfaces in both the painting and the W&N paints contained UV-fluorescent skins of medium and indicated the presence of Epsomite. Further indicators for water sensitivity in the W&N samples included high concentrations of polar chem-ical groups toward paint surfaces characterized using microscopy and Fourier Transform infrared spectroscopy. IntroductionRecent research h...