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Summary Provenance studies on archaeological metal objects rely on their trace element abundance pattern and lead isotopic composition. A comparison of these features in artifacts from different archaeological sites often requires a comparison of results reported by different laboratories. In this case reasonable conclusions can only be expected if it is assured that the respective laboratories produce compatible results. A comparison of some twenty copper‐based artifacts from Thermi I and II shows this compatibility still to be less than perfect between Oxford and Heidelberg — Mainz. We find the lead isotopic compositions reported by the two laboratories to agree within the stated uncertainties of the abundance ratios of 0.1 percent. The same is also true, to within 50 percent or better, for the contents of As, Sb, Ag, Au and possibly Ni. Serious discrepancies exist, however, for Co, Pb and Zn that we argue to be due to analytical problems at Oxford. Discriminant analysis of the data from all metal‐bearing occupational levels at Thermi reveals a remarkably good correspondence between trace element signature and occupational level which suggests that at the beginning of the third millennium BC intercourse between Lesbians and Aegean metal traders was rare. Lead isotope data show that the change in metal, at least that upon the transition from Towns I + II to Towns III–IV, was indeed due to a change in source region of the metal and not one caused by a change in technology.
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