EN 13523-22:2024
(Main)Coil coated metals - Test methods - Part 22: Colour difference - Visual comparison
General Information
- Abstract
This document specifies the procedure for determining the difference in the colour of an organic coating on a metallic substrate by visual comparison against a standard using either diffuse natural daylight or artificial daylight in a standard booth.
NOTE Results can differ between natural and artificial daylight.
It might be that two colour specimens will match in daylight but not under another light source. This phenomenon is known as metamerism (see EN 13523 3).
If a metameric match is to be reported in objective terms, spectrophotometric measurements (using CIE Standard Illuminants D65 and A) can be made, in accordance with EN 13523 3.
No statement is made about either the precision or the accuracy of this procedure since the results derived are neither in numerical form nor do they provide a pass/fail evaluation in objective terms. Therefore, this procedure is only intended to be used where the use of colour measuring instruments is not recommendable (evaluation of colour matches, inspection of metallic colours, etc.).
The standardization of such visual comparisons, by light sources, illuminating and viewing geometry and specimen size, provides for improved uniformity of results. This practice is essential for critical colour matching and is highly recommended for colour inspections.
- Status
- Published
- Publication Date
- 23-Apr-2024
- Technical Committee
- CEN/TC 139 - Paints and varnishes
- Drafting Committee
- CEN/TC 139/WG 9 - Testing of coil coated metals
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 24-Apr-2024
- Due Date
- 06-Aug-2025
- Completion Date
- 24-Apr-2024
Overview
EN 13523-22:2024 - "Coil coated metals - Test methods - Part 22: Colour difference - Visual comparison" (CEN) defines a standardized, qualitative procedure for visually assessing colour differences of organic coatings on metallic substrates. The method uses either diffuse natural daylight or artificial daylight (CIE D65 equivalent) in a colour‑matching booth to compare a test specimen against a reference standard. Results are descriptive (acceptable / not acceptable and directional colour notes) rather than numerical - this procedure is intended where instrumental measurement is not recommended (e.g., metallic colours, routine colour inspections).
Key topics and requirements
- Illumination
- Natural daylight: moderately overcast northern sky, uniform ≥ 2 000 lx; avoid direct sunlight and coloured reflections.
- Artificial daylight: spectral characteristics approximating CIE Standard Illuminant D65; illumination 1 000–4 000 lx depending on colour value; disclose lamp running hours.
- Use of a colour‑matching booth to exclude external light and standardize viewing.
- Viewing geometry and specimen handling
- Typical viewing distance ≈ 500 mm (observer range 10°).
- Viewing angles: minimize gloss effects (near‑normal) for natural daylight; 45° viewing with 0° illumination in booths.
- Preferred specimen size ≈ 150 × 100 mm (minimum 120 × 50 mm); uniform colour, gloss and flatness recommended.
- Environmental conditioning
- For accurate comparisons, condition specimens at (23 ± 2) °C and (50 ± 5) % RH per EN 23270 and EN 13523‑0.
- Observer considerations
- Ensure good colour vision (e.g., Farnsworth test), neutral clothing, and rest periods to avoid observer fatigue.
- Result expression
- Qualitative: acceptable / not acceptable, and directional descriptors (darker/lighter, more/less red/green, more/less yellow/blue).
- Precision/accuracy: not applicable - procedure is not numerical or pass/fail.
- Reporting
- Report must include product ID, reference to EN 13523‑22:2024, light source and spectral info, booth details, results, deviations and anomalies, and test date.
Practical applications and users
- Quality control and colour inspection in coil coating production
- Visual colour matching for metallic and special effect coatings
- Paint and coating formulators, colour technicians, production inspectors, specifiers, architectural finish evaluators, and referee laboratories for disputes
- Situations where instrumental methods are unsuitable or when a human visual judgment is required
Related standards
- EN 13523-0 (general introduction)
- EN 13523-3 (instrumental colour difference & metamerism - spectrophotometry using CIE D65 and A)
- EN 23270 (conditioning temperatures and humidities)
- EN ISO 3668 and EN ISO/CIE 11664 series (lighting/viewing geometry and colourimetry)
- EN 13523 series (other coil coated metals test methods)
Keywords: EN 13523-22:2024, coil coated metals, colour difference, visual comparison, colour matching booth, CIE D65, metamerism, colour inspection, coil coating test methods.
Relations
- Effective Date
- 03-May-2023
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
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Frequently Asked Questions
EN 13523-22:2024 is a standard published by the European Committee for Standardization (CEN). Its full title is "Coil coated metals - Test methods - Part 22: Colour difference - Visual comparison". This standard covers: This document specifies the procedure for determining the difference in the colour of an organic coating on a metallic substrate by visual comparison against a standard using either diffuse natural daylight or artificial daylight in a standard booth. NOTE Results can differ between natural and artificial daylight. It might be that two colour specimens will match in daylight but not under another light source. This phenomenon is known as metamerism (see EN 13523 3). If a metameric match is to be reported in objective terms, spectrophotometric measurements (using CIE Standard Illuminants D65 and A) can be made, in accordance with EN 13523 3. No statement is made about either the precision or the accuracy of this procedure since the results derived are neither in numerical form nor do they provide a pass/fail evaluation in objective terms. Therefore, this procedure is only intended to be used where the use of colour measuring instruments is not recommendable (evaluation of colour matches, inspection of metallic colours, etc.). The standardization of such visual comparisons, by light sources, illuminating and viewing geometry and specimen size, provides for improved uniformity of results. This practice is essential for critical colour matching and is highly recommended for colour inspections.
This document specifies the procedure for determining the difference in the colour of an organic coating on a metallic substrate by visual comparison against a standard using either diffuse natural daylight or artificial daylight in a standard booth. NOTE Results can differ between natural and artificial daylight. It might be that two colour specimens will match in daylight but not under another light source. This phenomenon is known as metamerism (see EN 13523 3). If a metameric match is to be reported in objective terms, spectrophotometric measurements (using CIE Standard Illuminants D65 and A) can be made, in accordance with EN 13523 3. No statement is made about either the precision or the accuracy of this procedure since the results derived are neither in numerical form nor do they provide a pass/fail evaluation in objective terms. Therefore, this procedure is only intended to be used where the use of colour measuring instruments is not recommendable (evaluation of colour matches, inspection of metallic colours, etc.). The standardization of such visual comparisons, by light sources, illuminating and viewing geometry and specimen size, provides for improved uniformity of results. This practice is essential for critical colour matching and is highly recommended for colour inspections.
EN 13523-22:2024 is classified under the following ICS (International Classification for Standards) categories: 25.220.60 - Organic coatings. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 13523-22:2024 has the following relationships with other standards: It is inter standard links to EN 13523-22:2017, EN 23270:1991, EN 13523-0:2021, EN 1396:2015, EN 10169:2010+A1:2012, EN ISO 1514:2016, EN 1396:2023, EN 13523-10:2024, EN 13523-10:2017, EN 13523-0:2014, EN 13523-23:2015, EN 13523-23:2002, EN 13523-24:2004, EN 13523-10:2010, EN 13523-23:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 13523-22:2024 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2024
Nadomešča:
SIST EN 13523-22:2017
Prevlečene kovine, ki se navijajo - Preskusne metode - 22. del: Barvna razlika -
Vizualna primerjava
Coil coated metals - Test methods - Part 22: Colour difference - Visual comparison
Bandbeschichtete Metalle - Prüfverfahren - Teil 22: Farbabstand - Visueller Vergleich
Tôles prélaquées - Méthodes d'essai - Partie 22: Différence de couleur - Comparaison
visuelle
Ta slovenski standard je istoveten z: EN 13523-22:2024
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
25.220.60 Organske prevleke Organic coatings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 13523-22
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2024
EUROPÄISCHE NORM
ICS 25.220.60 Supersedes EN 13523-22:2017
English Version
Coil coated metals - Test methods - Part 22: Colour
difference - Visual comparison
Tôles prélaquées - Méthodes d'essai - Partie 22 : Bandbeschichtete Metalle - Prüfverfahren - Teil 22:
Différence de couleur - Comparaison visuelle Farbabstand - Visueller Vergleich
This European Standard was approved by CEN on 1 January 2024.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13523-22:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Illumination for colour matching . 6
5.1 Natural daylight . 6
5.2 Artificial daylight . 6
5.3 Colour-matching booth . 6
6 Observer . 7
7 Sampling . 7
8 Test specimens and reference standards . 7
9 Procedure . 7
9.1 General. 7
9.2 Day-to-day routine . 7
9.3 Referee procedure . 8
10 Expression of results . 8
11 Precision . 8
12 Test report . 9
Bibliography . 10
European foreword
This document (EN 13523-22:2024) has been prepared by Technical Committee CEN/TC 139 “Paints and
varnishes”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2024, and conflicting national standards shall
be withdrawn at the latest by October 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13523-22:2017.
22:2017:
a) the text has been editorially revised and the normative references have been updated.
The EN 13523 series, Coil coated metals — Test methods, consists of the following parts:
— Part 0: General introduction
— Part 1: Film thickness
— Part 2: Gloss
— Part 3: Colour difference and metamerism — Instrumental comparison
— Part 4: Pencil hardness
— Part 5: Resistance to rapid deformation (impact test)
— Part 6: Adhesion after indentation (cupping test)
— Part 7: Resistance to cracking on bending (T-bend test)
— Part 8: Resistance to salt spray (fog)
— Part 9: Resistance to water immersion
— Part 10: Resistance to fluorescent UV radiation and water condensation
— Part 11: Resistance to solvents (rubbing test)
— Part 12: Resistance to scratching
— Part 13: Resistance to accelerated ageing by the use of heat
— Part 14: Chalking (Helmen method)
— Part 16: Resistance to abrasion
— Part 17: Adhesion of strippable films
— Part 18: Resistance to staining
— Part 19: Panel design and method of atmospheric exposure testing
— Part 20: Foam adhesion
— Part 21: Evaluation of outdoor exposed panels
— Part 22: Colour difference — Visual comparison
— Part 23: Resistance to humid atmospheres containing sulfur dioxide
— Part 24: Resistance to blocking and pressure marking
— Part 25: Resistance to humidity
— Part 26: Resistance to condensation of water
— Part 27: Resistance to humid poultice (Cataplasm test)
— Part 29: Resistance to environmental soiling (Dirt pick-up and striping)
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document specifies the procedure for determining the difference in the colour of an organic coating
on a metallic substrate by visual comparison against a standard using either diffuse natural daylight or
artificial daylight in a standard booth.
NOTE Results can differ between natural and artificial daylight.
It can be that two colour specimens will match in daylight but not under another light source. This
phenomenon is known as metamerism (see EN 13523-3).
If a metameric match is to be reported in objective terms, spectrophotometric measurements (using
CIE Standard Illuminants D65 and A) can be made, in accordance with EN 13523-3.
No statement is made about either the precision or the accuracy of this procedure since the results
derived are neither in numerical form nor do they provide a pass/fail evaluation in objective terms.
Therefore, this procedure is only intended to be used where the use of colour measuring instruments is
not recommendable (evaluation of colour matches, inspection of metallic colours, etc.).
The standardization of such visual comparisons, by light sources, illuminating and viewing geometry and
specimen size, provides for improved uniformity of results. This practice is essential for critical colour
ma
...