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.
It 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 previously adjusted to give the calibrated colorimetric value corresponding to
CIE standard illuminant D65, using a fluorescent reference standard with an assigned
CIE whiteness (D65/10°) value provided by an authorized laboratory, as described in
ISO 11475.
This document is not applicable to coloured papers or boards that incorporate fluorescent
dyes or pigments.