Stock Photo - Wolf-Dietrich Koester (R), owner of a painting that may show German composer Johann Sebastian Bach (1685-1750), and Dr. Alex von Bohlen (L), employee of the Centre for Synchrotron Radiation DELTA and researcher at the Leibniz Institute for Analytical Sciences, hold the painting in their hands in Dortmund, Germany, 20 November 2015. An elaborate examination using the particle accelerator at the Centre for Synchrotron Radiation DELTA is supposed to deliver more detailed information on the age of the painting. Photo: MONIKA SKOLIMOWSKA/dpa | usage worldwide. - Dortmund/North Rhine-Westphalia/Germany

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