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Paint and Coatings Industry Standards
ISO 787-25:1993 ISO 787-25:1993 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
The principle of the method specified is dispersing the test pigment and an agreed reference pigment in a particular test medium (mixture of an alkyd resin and fumed silica), preparing specimens on suitable substrates from the dispersions, measuring the tristimulus values of the specimens as described in ISO 7724-2, calculating the appropriate colour characteristics as described in ISO 7724-3.
