1. Independent Researcher, Formerly of the National Gallery, London WC2N 5DN, UK
2. Heritage Laboratory, Swedish National Heritage Board, 62122 Visby, Sweden
3. Department of Scientific Research, The British Museum, Great Russell Street, London WC1B 3DG, UK
4. Cultural Heritage Agency of the Netherlands, 1071 ZC Amsterdam, The Netherlands
5. Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy
6. The Edelstein Center for the Analysis of Ancient Artifacts, Department of Chemical Engineering, Shenkar College of Engineering, Design and Art, 12 Anna Frank St., Ramat Gan 52526, Israel
7. EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, UK
8. Department of Collections Services, National Museums Collection Centre, National Museums Scotland, Edinburgh EH5 1JA, UK