Contact: Claus Habfast
European Synchrotron Radiation Facility
Caption: Illustration showing where one of the two microsamples was taken in the painting (left), and an optical-microscope image of this sample (right). The overlay indicates the area of the sample being studied, and the four graphs below the concentration of the four key compounds in it which are linked to the discolouration.
Credit: K. Janssens, University of Antwerp
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