1. Institute for the Conservation and Valorization of Cultural Heritage, National Research Council; Via Madonna del Piano 10, Sesto Fiorentino I-50019 Italy
2. Opificio delle Pietre Dure; Via degli Alfani, 78, Florence I-50121 Italy
3. Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”; Politecnico di Milano; Piazza Leonardo da Vinci 32, Milano I-20133 Italy
4. Department of Chemistry “Ugo Schiff”; University of Florence; via della Lastruccia 3-13, Sesto Fiorentino (FI) I-50019 Italy
5. Haute-Ecole Arc Conservation-Restauration, Espace de l'Europe 11; Neuchâtel 2000 Switzerland
6. Department of Chemistry; University of Milan; Via Camillo Golgi 19, Milan I-20133 Italy