NF T31-244:2007 General methods of test for pigments and extenders - Part 25 : comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method.
2007NF T31-244:2007 General methods of test for pigments and extenders - Part 25 : comparison of the colour, in full-shade systems, of white, black and coloured pigments - Colorimetric method.