ISO 5631-1:2009
Paper and board — Determination of colour by diffuse reflectance — Part 1: Indoor daylight conditions (C/2 degrees)
ISO 5631-1:2009 specifies a method for measuring the colour of paper and board by the diffuse reflectance method with the elimination of specular gloss.
ISO 5631-1:2009 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 provided by an ISO/TC 6 authorized laboratory, as described in ISO 2470-1.
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Scope
Normative references
Terms and definitions
Principle
Apparatus
Sampling and conditioning
Preparation of test pieces
Procedure
Calculation
CIE tristimulus values
CIELAB coordinates
Dispersion of the results
Expression of results
Precision
Test report
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Scope
Normative references
Terms and definitions
Principle
Apparatus
Sampling and conditioning
Preparation of test pieces
Procedure
Calculation
CIE tristimulus values
CIELAB coordinates
Dispersion of the results
Expression of results
Precision
Test report