FprEN ISO 787-1

• Abstract:

  Procedure for comparing the colour of a coloured pigment with that of an agreed sample. The procedures described in this document are acceptable but the method using an automatic muller is the reference method. The binder is not specified. It shall be agreed between the interested parties. If no binder is agreed, linseed oil, complying with the specification in ISO 150, should be used. - Replaces ISO/R 787/1:1968.

• Status: Not Published
• Publication Date: 24-Jan-2027
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: CEN/TC 298 - Pigments and extenders
• Drafting Committee: CEN/TC 298 - Pigments and extenders
• Current Stage: 5020 - Submission to Vote - Formal Approval
• Start Date: 27-Aug-2026
• Completion Date: 27-Aug-2026
• Ref Project: kSIST FprEN ISO 787-1:2026 - General methods of test for pigments and extenders - Part 1: Comparison of colour of pigments (ISO/FDIS 787-1:2026)

• Consolidated By: ISO/FDIS 787-1 - General methods of test for pigments and extenders — Part 1: Comparison of colour of pigments
• Effective Date: 12-Feb-2026
• Revises: EN ISO 787-1:2017 - General methods of test for pigments and extenders - Part 1: Comparison of colour of pigments (ISO 787-1:1982)
• Effective Date: 30-Oct-2024

Overview

FprEN ISO 787-1:2026 (General methods of test for pigments and extenders - Part 1: Comparison of colour of pigments) is a key international standard published by CEN and ISO. It specifies standardized procedures for comparing the colour of pigments to an agreed reference sample. Ensuring consistent colour assessment is essential for the pigments and extenders industry, supporting quality control, supplier conformity, and regulatory compliance. The standard is relevant for manufacturers, quality assurance labs, and any stakeholders involved in the production and application of coloured pigments.

Key Topics

• Reference Method: The preferred reference method for colour comparison uses an automatic muller, ensuring reproducibility and minimized variability in pigment sample preparation.
• Alternate Methods: Hand muller or palette knife procedures are included as acceptable alternatives when automatic equipment is unavailable.
• Binder Requirements: The type of binder used to disperse the pigment is not prescribed and must be agreed between the involved parties. If no agreement is reached, use of refined linseed oil (per ISO 150) is recommended.
• Sample and Substrate: Clear procedures specify accurate sample collection and preparation of pigment pastes, with precise apparatus recommendations and substrate requirements for colour comparison.
• Assessment Techniques: Visual assessment under standard lighting (preferably artificial daylight, in accordance with ISO 3668) is essential. Colorimetric evaluation using a colorimeter is also permitted, utilizing established CIE colour spaces and colour difference formulas for objective analysis.
• Reporting Requirements: The standard stipulates essential information to be included in the test report, such as the pigment identification, binder, procedure details, and colour comparison results.

Applications

FprEN ISO 787-1:2026 is widely applicable in the following areas:

• Quality Control in Manufacturing: Ensures pigments meet customer- and industry-specified colour standards. Supports batch-to-batch consistency and enables objective acceptance or rejection of pigment lots.
• Supplier and Buyer Agreements: Provides a neutral, standardized method to compare colour, reducing disputes and ensuring clarity in specification compliance.
• Product Development: Enables R&D and technical staff to validate new pigment formulations against benchmark samples, streamlining innovation while maintaining consistent aesthetics.
• Regulatory Compliance: Facilitates documentation and proof of conformity for quality systems (such as ISO 9001) and supports traceability and transparency in audits.
• Laboratory Testing: Used in both in-house and third-party labs for routine pigment performance characterization and competitive marketplace evaluations.

Related Standards

For a comprehensive approach to pigment and extender testing, the following related international standards are frequently referenced alongside FprEN ISO 787-1:

• ISO 150: Raw, refined, and boiled linseed oil for paints and varnishes - Specifications and methods of test.
• ISO 3668: Paints and varnishes - Visual comparison of colour of paints.
• ISO 15528: Paints, varnishes and raw materials for paints and varnishes - Sampling.
• ISO 18314-1 and ISO 18314-5: Analytical colorimetry - Practical measurement and determination of colour differences.
• ISO 18451-1: Pigments, dyestuffs and extenders - General terms and definitions.
• ISO/CIE 11664-4 & 11664-6: Colorimetry - CIE 1976 Lab* and CIEDE2000 colour-difference formulae.

Implementing FprEN ISO 787-1:2026 ensures reliable, defendable, and internationally recognized methods for the comparison of pigment colours, bringing increased consistency, accuracy, and credibility to pigment characterization within the global marketplace.

SLOVENSKI STANDARD
oSIST prEN ISO 787-1:2026
01-maj-2026
Splošne preskusne metode za pigmente in polnila - 1. del: Primerjava barve
pigmentov (ISO/DIS 787-1:2026)
General methods of test for pigments and extenders - Part 1: Comparison of colour of
pigments (ISO/DIS 787-1:2026)
Allgemeine Prüfverfahren für Pigmente und Füllstoffe - Teil 1: Farbvergleich von
Pigmenten (ISO/DIS 787-1:2026)
Méthodes générales d'essai des pigments et matières de charge - Partie 1:
Comparaison de la couleur des pigments (ISO/DIS 787-1:2026)
Ta slovenski standard je istoveten z: prEN ISO 787-1
ICS:
87.060.10 Pigmenti in polnila Pigments and extenders
oSIST prEN ISO 787-1:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 787-1:2026
oSIST prEN ISO 787-1:2026
DRAFT
International
Standard
ISO/DIS 787-1
ISO/TC 256
General methods of test for
Secretariat: DIN
pigments and extenders —
Voting begins on:
Part 1: 2026-03-24
Comparison of colour of pigments
Voting terminates on:
2026-06-16
Méthodes générales d'essai des pigments et matières de charge —
Partie 1: Comparaison de la couleur des pigments
ICS: 87.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 787-1:2026(en)
oSIST prEN ISO 787-1:2026
DRAFT
ISO/DIS 787-1:2026(en)
International
Standard
ISO/DIS 787-1
ISO/TC 256
General methods of test for
Secretariat: DIN
pigments and extenders —
Voting begins on:
Part 1:
2026-03-24
Comparison of colour of pigments
Voting terminates on:
2026-06-16
Méthodes générales d'essai des pigments et matières de charge —
Partie 1: Comparaison de la couleur des pigments
ICS: 87.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 787-1:2026(en)
ii
oSIST prEN ISO 787-1:2026
ISO/DIS 787-1:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus and materials . 1
5 Sampling . 2
6 Procedure for sample generation . 2
6.1 Procedure using an automatic muller.2
6.1.1 Test portion .2
6.1.2 Preparation of pigment dispersion .2
6.2 Procedure using a hand muller or palette knife .3
6.2.1 Test portion .3
6.2.2 Preparation of pigment dispersion .3
7 Colour comparison . 3
8 Test report . 3

iii
oSIST prEN ISO 787-1:2026
ISO/DIS 787-1:2026(en)
Foreword
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This document was prepared by Technical Committee ISO/TC 256, Pigments, dyestuffs and extenders, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 298,
Pigments and extenders, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
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