Fig. 8

Representative fluorescence decays of varnish removal FLIM. The average fluorescence lifetime contrast images, same as in Fig. 2, are in the top row. Three example pixels representing varnish (blue line), paint (red line), and ground (yellow line) were marked by a cross (\(\times\)), a plus (\(+\)), and a circle (\(\circ\)), respectively. The fluorescence decays in these pixels are plotted in the graphs in the lower row. The IRF is shown in grey. The columns of the figure contain data taken after the following solvent application methods: A swab rolling with no mechanical action, B swab rolling with mechanical action, C gel application with no mechanical action, and D gel application with mechanical action. The fluorescence lifetime ranges and false-colour scales are in the top-left corner of each panel. Scale bars 2 mm