1. Department of HistoryAnhui University Hefei 230039 Anhui China
2. Dipartimento di Scienze e TecnologieUniversità degli Studi del Sannio via De Sanctis snc I‐82100 Benevento Italy
3. CRACS, Center of Research on Archaeometry and Conservation ScienceComplesso Universitario di Monte Sant′Angelo Via Cupa Nuova Cintia, 21 I‐80126 Naples Italy
4. Department of Materials Science and Engineering, HSSEAS School of Engineering and Applied ScienceUniversity of California Los Angeles 420 Westwood Plaza, 3111 Engineering V Los Angeles CA 90095‐1595 USA
5. Molecular and Nano Archaeology Laboratory, HSSEAS School of Engineering and Applied ScienceUniversity of California Los Angeles 420 Westwood Plaza, 3111 Engineering V Los Angeles CA 90095‐1595 USA