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Heritage Science
Fig. 5 | Heritage Science

Fig. 5

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. 5

a Detail color image, (b) The XRF elemental map of lead (Pb) L-alpha emission, (d) reflectance map of hydroxyl feature of lead white at 1446 nm, where “white” and “gray” areas indicate the presence of the 1446-nm lead white absorption and “black” areas indicate the lack of this spectral feature. Map obtained using SAM algorithm and equalization of histogram applied. c Reflectance spectra from “white” (bottom of plot) to “black” (top of plot) areas in reflectance map

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