1. Conservation Department , Austrian National Library , Josefsplatz 1 , 1150 Vienna , Austria
2. Conservation Department, Royal Library , Copenhagen , Denmark
3. Conservation Studio , Heiligenstädterstraße 187/2 , 1190 Vienna , Austria
4. Dipartimento di Scienze e Innovazione Tecnologica , Università degli Studi del Piemonte Orientale , Alessandria , Italy
5. Department Conservation and Restoration, Faculty of Sciences and Technology, New University of Lisbon , Campus Caparica , 2829-516 Caparica , Portugal
6. Institute of Chemical Technologies and Analytics, Vienna University of Technology , Vienna , Austria
7. Conservation Science Department , Kunsthistorisches Museum Wien , Vienna , Austria
8. Conservation Science Department, Kunsthistorisches Museum Wien , Vienna , Austria
9. X-Ray Center , Vienna University of Technology , Vienna , Austria
10. Institute of Art and Technology , University of Applied Arts Vienna , Vienna , Austria
11. The Walters Art Museum , Baltimore , MD , USA
12. Conservation Department, Austrian National Library , Vienna , Austria
13. University of Cambridge , The Henry Welcome Building, Fitzwilliam Street , Cambridge CB2 1QH , UK
14. University of Copenhagen , Copenhagen , Denmark