1. Department of Materials Science, Delft University of Technology, Mekelweg 2, 2628CD Delft, The Netherlands, Centre for Micro- and Trace Analysis, Department of Chemistry, Universiteit Antwerpen, Universiteitsplein 1, 2610 Antwerp, Belgium, Kröller-Müller Museum, Houtkampweg 6, P.O. Box 1, 6730 AA Otterlo, The Netherlands, Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22603 Hamburg, Germany, Centre of Research and Restoration of the French Museums, UMR-171-CNRS, Palais du Louvre, Porte des...