Fig. 5
From: Visualising varnish removal for conservation of paintings by fluorescence lifetime imaging (FLIM)
Painting cross-sections. Samples from the painting were extracted where solvent was A applied by a swab with no mechanical action, B applied by a swab with mechanical action, and C not applied to leave the varnish intact. The left three columns show the intensity-weighted fractional contributions. The representative global three-exponential fluorescence lifetimes are shown in the bottom right corner of each inset. The ranges of the fractional contributions and the false-colour scales are underneath each inset. The fourth column shows the UV-excited broadband visible fluorescence images of the cross-sections. The rightmost column shows dark-field reflectance images with the labels and arrows pointing to the different painting layers. 1 is the embedding resin, 2 is the varnish, 3 is the paint, and 4 is the ground. Scale bars 100 μm