1. Department of Scientific Research, The British Museum, Great Russell Street, London WC1B 3DG, UK
2. Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
3. Cultural Heritage Laboratory, Cultural Heritage Agency of The Netherlands, Hobbemastraat 22, 1071 ZC Amsterdam, The Netherlands
4. Analytical Sciences, van ‘t Hoff Institute for Molecular Sciences, Faculty of Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
5. Conservation and Restoration of Cultural Heritage, Amsterdam School for Heritage, Memory and Material Culture (AHM), Faculty of Humanities, University of Amsterdam, P.O. Box 94552, 1090 GN Amsterdam, The Netherlands