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Heritage Science
Fig. 8 | Heritage Science

Fig. 8

From: Integrated X-ray fluorescence and diffuse visible-to-near-infrared reflectance scanner for standoff elemental and molecular spectroscopic imaging of paints and works on paper

Fig. 8

a Detail color image of the trees at the top of the painting. b False-color image (RGB, 1250, 850, 650 nm), c reflectance spectra of viridian (yellow), cobalt blue (blue), and the combination of viridian and cobalt blue: less cobalt blue to viridian (red), more cobalt blue than viridian (black). Relatively pure viridian was used for the grass, but a mixture of viridian and cobalt blue was used for the trees. The arrow points to the absorption shoulder characteristic of viridian. XRF elemental maps of d cobalt, Co, and e chromium, Cr.

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