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. 2019 Aug 23;5(8):eaaw7794. doi: 10.1126/sciadv.aaw7794

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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).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 5 — (A) Color image of the Master of the Dominican Effigies’ Christ and the Virgin Enthroned with Forty Saints (ca. 1340), Rosenwald Collection, National Gallery of Art. (B) Color detail studied. (C) Map of azurite obtained from the reflectance spectrum (H). (D) Elemental map of zinc (Kα). (E) Elemental map of As (Kβ). (F) Map of the As─OH reflectance feature attributed to mixite and the spectral features of azurite in visible and NIR (I). (G) Mid-IR reflectance spectra of the dark blue and light blue areas, in addition to mixite and azurite standards.