1. Department of Conservation and Technology The Courtauld Institute of Art Somerset House, Strand London WC2R 0RN UK
2. University of Antwerp, Campus Groenenborger Groenenborgerlaan 171 Antwerp G.V. 144 2020 Belgium
3. CNR‐ISTM Via Elce di sotto 9 Perugia 06123 Italy
4. CNR‐INO Largo E. Fermi 6 Florence 50125 Italy
5. Centre of excellence SMAArt c/o Department of Chemistry, Biology and Biotechnology University of Perugia Via Elce di sotto 9 Perugia 06123 Italy
6. Centre de Recherche sur la Conservation, (CRC, USR 3224), Muséum National d'Histoire Naturelle Ministère de la Culture et de la Communication CNRS, 36 rue Geoffroy‐Saint‐Hilaire, CP21 Paris 75005 France
7. Delft University of Technology Mekelweg 2 Delft 2628 the Netherlands