Stranica 41 [41]
OCR
Bc A BR 7 greement n" 228330 Figure 1-26 shows the images shown in Figure 1-25, in more detail. Figure 1-26. UV-induced luminescence images image of a detail from a wall painting fragment from the British Museum (Winged youth from the Tomb of the Nasonii, 1883,0505.5) (a) uncorrected for the pigment-binder effect and (b) following correction. (c) Visible-reflected image and (d) UV-reflected image of the same wall painting fragment. The uncorrected image (Figure 1-26 (a)) generally shows a strong blue luminescence (with the exception of the dark areas which have undergone conservation). However, the figure can still be distinguished, as its luminescence is different from the background. The corrected image (Figure 1-26 (b)) shows a uniform distribution of luminescence and the anatomical details of the figure are less distinguishable. By contrast, the correction does not have an effect on the white background, which reflects radiation uniformly. This result is indicative of the presence of a layer of varnish which absorbs all the UV radiation, as Version No. 1.0 33 Date : 14/10/2013
