Stock Photo - Wolf-Dietrich Koester, owner of a painting that may show German composer Johann Sebastian Bach (1685-1750), holds the painting in his hands at the Centre for Synchrotron Radiation DELTA 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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