ISO 787-25:2019
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
This document specifies a general test method for comparing the colour, in full-shade systems, of white, black or coloured pigments with that of an agreed reference pigment, using a colorimetric procedure.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Materials
5.1 Alkyd resin (binder)
5.2 Fumed silica
5.3 Preparation of the test medium
6 Apparatus
7 Sampling
8 Procedure
8.1 General
8.2 Test portion
8.2.1 Generals
8.2.2 White pigments
8.2.3 Coloured and black pigments
8.3 Preparation of pigment dispersions
8.4 Preparation of test specimens
8.4.1 General
8.4.2 White pigments
8.4.3 Coloured and black pigments
8.5 Measurement
9 Expression of results
9.1 White pigments and black pigments
9.1.1 Relative hue
9.1.2 Amount of relative hue
9.2 Lightness difference
9.3 Coloured pigments
10 Test report
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Materials
5.1 Alkyd resin (binder)
5.2 Fumed silica
5.3 Preparation of the test medium
6 Apparatus
7 Sampling
8 Procedure
8.1 General
8.2 Test portion
8.2.1 Generals
8.2.2 White pigments
8.2.3 Coloured and black pigments
8.3 Preparation of pigment dispersions
8.4 Preparation of test specimens
8.4.1 General
8.4.2 White pigments
8.4.3 Coloured and black pigments
8.5 Measurement
9 Expression of results
9.1 White pigments and black pigments
9.1.1 Relative hue
9.1.2 Amount of relative hue
9.2 Lightness difference
9.3 Coloured pigments
10 Test report
Bibliography