Optical and colorimetric characterization on binary mixtures prepared with coloured and white historical pigments

To this aim, painting samples were prepared in laboratory mixing the coloured pigments with achromatic ones in variable weight concentration from 10% to 90% for each of the components. This is necessary to evaluate the minimum quantities of white that could change the coloured pigments SRF% spectra. Also the analysis of colour coordinates is performed to put in evidence the L*, a*, b* trend in CIELAB 1976 space.