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Fig. 3 | Heritage Science

Fig. 3

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. 3

Irises. a Flower, normal Raman spectra: eosin lake pigment, acquired in the red layers visible in the cross-section shown in Fig. 2a (1); eosin lake reference sample, F.H. Jennison, plate III-1, 1900 [27] (the asterisk indicates a peak due to the barite substrate) (2); and spectrum acquired in the particles that fluoresce bright yellow under UV illumination in the same sample (3). λ0 = 785 nm. b Pink background, SERS spectra: microsample removed from the pink background (1), and eosin lake reference sample (2). λ0 = 488 nm

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