“…However, as can be seen, the four natron glasses fail to form a coherent group; the plant-ash glasses mainly form into a correlated cluster, with the raw glass samples occupying extreme positions. Work by Brill and collaborators [1,5,7] has provided lead isotope data for glasses of a range of archaeological contexts. A group of results from ten Islamic vessel fragments on the Serc¸e Limini shipwreck dated to c. 1025 [1, Table 1.1], including four lead-silica glasses, shows that six fall within the results for plant ash samples with the remainder being distinct (Fig.…”