Table of Contents

1 -  AS/NZS 1580.601.4:1994 PAINTS AND RELATED MATERIALS-METHODS OF TEST - COLOUR-CALCULATION OF COLOUR DIFFERENCES
1 -  PREFACE
1 -  FOREWORD
2 -  METHOD
2 -  1 SCOPE
2 -  2 REFERENCED DOCUMENTS
2 -  3 DEFINITIONS
2 -  4 PRINCIPLE
2 -  5 CALCULATIONS
2 -  5.1 General
3 -  5.2 Total colour difference using the CIELAB colour difference formula
3 -  5.3 Lightness difference
3 -  5.4 Chroma difference
3 -  5.5 Hue difference
4 -  6 COLOUR DIFFERENCE
4 -  6.1 General
4 -  6.2 Colour difference of near white test specimens
4 -  7 TEST REPORT

Abstract

Provides a method for the quantitative evaluation of small colour difference between paint films.

RECONFIRMATION NOTICE
Technical Committee CH-003 has reviewed the content of this publication and in accordance with Standards Australia procedures for reconfirmation, it has been determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the original date of publication. Users are advised to ensure that they are using the latest versions of such documents as appropriate, unless advised otherwise in this Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for reconfirmation on 30 May 2013.
Approved for reconfirmation in New Zealand on behalf of the Standards Council of New Zealand on 26 August 2013.
The following are represented on Technical Committee CH-003:

Australasian Corrosion Association
Australian Paint Approval Scheme
Australian Paint Manufactures' Federation
Australian Pipeline Industry Association
Institution of Professional Engineers New Zealand
Master Painters New Zealand Association
Water Corporation Western Australia

Scope

This Standard sets out the method for the quantitative evaluation of small colour differences between paint films.
NOTES:
1 There are numerous formulae for calculating a colour difference from the colour coordinates of two specimens. For various reasons the results given by such formulae, including the one defined here, do not in all cases agree satisfactorily with visual perception, nor are they likely to agree with each other. In 1976, the Commission Internationale de l'Eclairage (CIE) recommended two formulae for general use. One of these, the CIE (L*a*b*) colour difference formula, has proved to be of practical value for the colorimetric evaluation of paint films and a detailed description may be obtained from CIE Publication No. 15.2.
2 This method of evaluating colour difference should not be confused with the Hunter Lab system.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Reconfirmation Notice 24-09-2013
Pages
ISBN
Committee	CH-003
Supersedes	DR 93156 AS 1580.601.2-1975 AS 1580.601.3-1975