Fig. 4 INS spectra of different human bones from the Roman period [humerus, ulna, femur, and fibula from the same skeleton, Guidonia-Montecelio, Italy (tomb 36)]. INS spectra of different human bones from the Roman period [humerus, ulna, femur, and fibula from the same skeleton, Guidonia-Montecelio, Italy (tomb 36)]. Comparison with modern human bone samples (5) burned at 400°, 500°, and 800°C. G. Festa et al. Sci Adv 2019;5:eaaw1292 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).