M00020602
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ISO DIS 5631-1 2015 Edition, January 19, 2015 PAPER AND BOARD - DETERMINATION OF COLOUR BY DIFFUSE REFLECTANCE - PART 1: INDOOR DAYLIGHT CONDITIONS (C/2 DEGREES)
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Availability date: 07/14/2021
Description / Abstract:
This part of ISO 5631 specifies a method for measuring the
colour of paper and board by the diffuse reflectance method with
the elimination of specular gloss.
This part of ISO 5631 is not applicable to coloured papers or
boards which incorporate fluorescent dyes or pigments. It may be
used to determine the colour of papers or boards which 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 (C/2°) provided by an authorized
laboratory, as described in ISO 2470-1.