1. Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium, Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, NL-2628CD Delft, The Netherlands, Laboratoire du Centre de Recherche et de Restauration des Musées de France (LC2RMF), CNRS UMR 171, Palais du Louvre, Porte des Lions, 14, Quai François Mitterand, F-75001 Paris, France, European Synchrotron Radiation Facility, Polygone Scientifique Louis Néel, 6, rue Jules Horowitz, F...