Fig. 4 Degradation products in a 14th century painting containing discolored vermilion layers. Degradation products in a 14th century painting containing.

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Fig. 4 Degradation products in a 14th century painting containing discolored vermilion layers. Degradation products in a 14th century painting containing discolored vermilion layers. (A) A picture of the 14th century painting [St. John the Evangelist Reproving the Philosopher Crato by Francescuccio di Cecco Ghissi, North Carolina Museum of Art (1375)]. Inset is a magnified image showing the grey degradation on/in the vermilion pigment layer. A cross-sectional sample was taken from the indicated area. (B) Pump-probe image of the cross-section sample was acquired at 720 and 817 nm, 0.3 mW each, τ = 260 fs. Squares in this image indicate ROIs (magenta, ROI1; red, ROI2; green, ROI3; cyan, ROI4; blue, ROI5), with their pump-probe signals shown in (C). Inset on the left side is the bright-field image of a cross section, and inset on the right side is the confocal reflectance image of the identical FOV. (C) Extracted pump-probe responses from the cross section at locations indicated in (B) (photo courtesy of the North Carolina Museum of Art). Jin Yu et al. Sci Adv 2019;5:eaaw3136 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).