Fig. 11
From: Visualising varnish removal for conservation of paintings by fluorescence lifetime imaging (FLIM)
Fractional contribution histograms separated varnish samples by their ageing conditions. A Fractional contribution histograms were created from the FLIM data of dammar varnish subject to ambient (red lines) or accelerated (blue lines) ageing conditions. The graph panels show the fractional contribution histograms for the three different representative lifetimes (top-right corner). The image on the right shows the fractional contribution contrast for the longest lifetime component. B The same as above, but based on the mastic varnish FLIM data. All histograms were normalised to make their integrals equal to 1