1 Scope
This document specifies a method for measuring the colour of paper and board by the
diffuse reflectance method with the elimination of specular gloss.
This document is primarily intended for measuring the colour of paper and board to
be used in the graphic arts industry, where that industry specifies the measurement
of colour under D50/2° conditions in accordance with ISO 13655. This method differs from ISO 13655, in that the UV content of the illumination is adjusted to a different level.
The method can be used to determine the colour of papers or boards that contain fluorescent
whitening agents, provided the UV content of the illumination on the test piece has
been adjusted to conform to that in the CIE illuminant C, using a fluorescent reference
standard that fulfils the requirements for international fluorescent reference standards
of level 3 (IR3) as prescribed by ISO 2469 with an assigned ISO brightness value provided by an authorized laboratory, as described
in ISO 2470‑1.
This document is not applicable to coloured papers or boards that incorporate fluorescent
dyes or pigments.