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Published byAkseli Heikkilä Modified over 5 years ago
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Fig. 3 Elemental composition of archaeological blue particle and blue reference pigments measured by EDS. Elemental composition of archaeological blue particle and blue reference pigments measured by EDS. (A) Blue particle isolated from medieval dental calculus. (B) Afghan lazurite reference pigment (RC, ). (C) Azurite reference pigment (RC, ). (D) Smalt reference pigment (RC, ). (E) Vivianite reference pigment (RC, ). The archaeological blue particles lack copper (Cu), cobalt (Co), and iron (Fe) but closely match the spectrum produced by the tectosilicate lazurite. Scale bars, 20 μm. Additional reference spectra are provided in fig. S7. Raw data are provided in data file S2. Credit: M. Tromp. A. Radini et al. Sci Adv 2019;5:eaau7126 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).
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