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Fig. 7 | Heritage Science

Fig. 7

From: Van Gogh’s Irises and Roses: the contribution of chemical analyses and imaging to the assessment of color changes in the red lake pigments

Fig. 7

Roses. Photomicrographs taken with visible illumination of paint cross-sections removed from a protected area in the edge of the tabletop (a); from a visibly faded area in the tabletop (c); and from a flower (e), all taken with a ×400 magnification. In a, the arrow indicates a spot where the blue paint layer at the top of the cross-section has a gap and the pink lake pigment in the layer below has faded. b, d, f are electron backscattered (BSE) images of the samples shown in a, c, e, respectively. Image (b) was taken with ×555 magnification; (d) is a detail taken on the left side of the sample with a ×1400 magnification (the location is indicated in c by white lines); and f is a detail taken on the right side of the sample with a ×1420 magnification (the location is indicated in e by white lines)

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