Fig. 6: Co:As correlation biplot. | npj Heritage Science

Fig. 6: Co:As correlation biplot.

From: Illuminating Rembrandt’s Chiaroscuro in The Night Watch: the painting process of Van Ruytenburch’s costume

Fig. 6

a False color map (overlaid for visibility on the visible image) of the As-K: Co-K intensity biplot (b) showing two distinct groups. Pixels colored blue: As correlated to Co; pixels colored orange: As uncorrelated to Co. c, e, f Stereomicroscopic images of the orange arsenic-containing paint (d) microscopic image (Hirox) of an intact blue smalt particle. g Composite of inverted and colored MA-XRF elemental maps for tin (Sn-L, yellow), arsenic (As-K, orange), iron (Fe-K, light brown), calcium (Ca-K, dark red-brown) and cobalt (Co-K, blue). h image showing an example of a gold metal surface (orange glow reflection indicated with a white arrow).

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