ISO 5631-3:2022 PDF

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.

ISO 5631-3:2022 Referenced Document

ISO 186 Paper and board - Sampling to determine average quality
ISO 2469 Paper, board and pulps*， 2024-03-01 Update
ISO 2470-1 Paper, board and pulps - Measurement of diffuse blue reflectance factor - Part 1: Indoor daylight conditions (ISO brightness)

2022 ISO 5631-3:2022 Paper and board — Determination of colour by diffuse reflectance — Part 3: Indoor illumination conditions (D50/2°)
2015 ISO 5631-3:2015 Paper and board - Determination of colour by diffuse reflectance - Part 3: Indoor illumination conditions (D50/2 degrees)
2014 ISO 5631-3:2014 Paper and board - Determination of colour by diffuse reflectance - Part 3: Indoor illumination conditions (D50/2 degrees)
2008 ISO 5631-3:2008 Paper and board - Determination of colour by diffuse reflectance - Part 3: Indoor illumination conditions (D50/2 degrees)