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Heritage Science
Fig. 6 | Heritage Science

Fig. 6

From: Identification and mapping of ancient pigments in a Roman Egyptian funerary portrait by application of reflectance and luminescence imaging spectroscopy

Fig. 6

a Visible-induced NIR luminescence photograph (Walters Art Museum). b Combined maps (abundance map for blue endmember, spectral angle map for black endmember) for the second derivative Egyptian blue endmembers in c, overlaid with 10% transparency onto the portrait to show luminescence distribution. d Spectra from mapped pixels in the woman’s face in b, designated by the horizontal arrows, confirm that the luminescence seen in the photograph in a is indeed Egyptian blue, due to the 897 nm spectral feature, and able to be mapped by LIS

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