1. Institute of Heritage Science, National Research Council (CNR-ISPC), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
2. Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
3. Imaging and Sensing for Archaeology, Art History and Conservation (ISAAC) Lab, School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK
4. Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino (Florence), Italy