1. 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 Mitterrand, F-75001 Paris, France
2. European Synchrotron Radiation Facility, Polygone Scientifique Louis Néel, 6, rue Jules Horowitz, F-38000 Grenoble, France
3. Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, NL-2628CD Delft, The Netherlands
4. University of Antwerp, Department of Chemistry, Universiteitsplein 1, B-2610 Wilrijk, Belgium