prEN ISO 22700

SLOVENSKI STANDARD
01-april-2026
Usnje - Merjenje barve in barvne razlike končno obdelanega usnja (ISO/DIS
22700:2026)
Leather - Measuring the colour and colour difference of finished leather (ISO/DIS
22700:2026)
Leder - Messung der Farbe und des Farbunterschiedes von zugerichtetem Leder
(ISO/DIS 22700:2026)
Cuir - Mesurage de la couleur et des écarts de couleur des cuirs finis (ISO/DIS
22700:2026)
Ta slovenski standard je istoveten z: prEN ISO 22700
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 22700
IUF 474
IULTCS
Leather — Measuring the colour
Secretariat: ISO
and colour difference of finished
leather
Voting begins on:
2026-02-13
Cuir — Mesurage de la couleur et des écarts de couleur des cuirs
Voting terminates on:
finis
2026-05-08
ICS: 59.140.30
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,
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USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
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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 22700:2026(en)
IUF 474:2026(en)
DRAFT
ISO/DIS 22700:2026(en)
International
IUF 474:2026(en)
Standard
ISO/DIS 22700
IUF 474
IULTCS
Leather — Measuring the colour
Secretariat: ISO
and colour difference of finished
leather
Voting begins on:
Cuir — Mesurage de la couleur et des écarts de couleur des cuirs
Voting terminates on:
finis
ICS: 59.140.30
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
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NATIONAL REGULATIONS.
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TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Reference number
Published in Switzerland ISO/DIS 22700:2026(en)
IUF 474:2026(en)
ii
ISO/DIS 22700:2026(en)
IUF 474:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus and materials . 3
6 Procedure . 4
6.1 Standardization of colour measuring instrument .4
6.2 Sampling .4
6.3 Measuring procedure .5
7 Method of calculation . 5
7.1 General .5
7.2 Tristimulus values .5
7.3 CIE 1976L*, a*, b*, C* and h .6
ab ab
7.4 Calculation of the CIEDE2000 total colour difference formula .7
8 Test report . 8
Annex A (informative) Background to standard procedure for measuring the colour of finished
leather . 9
Bibliography .12

iii
ISO/DIS 22700:2026(en)
IUF 474:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by the Fastness Test Commission of the International Union of Leather
Technologists and Chemists Societies (IUF Commission, IULTCS) in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, the secretariat of which
is held by UNI, in accordance with the agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further
the advancement of leather science and technology. IULTCS has three Commissions, which are responsible
for establishing international methods for the sampling and testing of leather. ISO recognizes IULTCS as an
international standardizing body for the preparation of test methods for leather.
This second edition cancels and replaces the first edition (ISO 22700:2019) which has been technically
revised.
The main changes are as follows:
— In the Scope deletion of D65 definition as an illuminant for visual evaluation, add reference to ISO 7906,
which defines D65 as an illuminant for visual evaluation.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DIS 22700:2026(en)
DRAFT International Standard
IUF 474:2026(en)
Leather — Measuring the colour and colour difference of
finished leather
1 Scope
This document specifies a method for the correct measurement of the colour of finished leather by
instrumental means. The document describes general concepts of colour measurement adapted to leather
and the calculation of differences in colour.
This document defines the following:
a) the use of D65 light source 10° as standard conditions for colour matching, for the definition of daylight
simulators and as the reference light source for metamerism analysis;
b) the use of CIEDE2000 as the colour difference formula.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 2419, Leather — Physical and mechanical tests — Specimen and test piece conditioning
ISO 7906, Leather — Tests for colour fastness — General principles of testing
ISO 11664-3, Colorimetry — Part 3: CIE tristimulus values
ISO 11664-4, Colorimetry — Part 4: CIE 1976 L*a*b* colour space
ISO/CIE 11664-6, Colorimetry — Part 6: CIEDE2000 colour-difference formula
EN 15987, Leather — Terminology — Key definitions for the leather trade
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 15987 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
colour measurement
numerical representation of the colour of a specimen obtained by use of a colour measuring instrument
(3.2) in terms of tristimulus values, colour coordinates or spectral response within the visible and near UV
spectra
ISO/DIS 22700:2026(en)
IUF 474:2026(en)
3.2
colour measuring instrument
device which measures reflected radiations in the visible spectrum (wavelengths between 360 nm and
780 nm) covering as a minimum area wavelengths between 400 nm and 700 nm
Note 1 to entry: Instruments included in this definition are named colorimeters and spectrophotometers.
3.3
geometry
relative position illumination/observer (detector)
Note 1 to entry: Typical geometries include the following:
— d/0°;
— 0°/d;
— 0°/45°;
— 45°/0°;
with a tolerable angle of 0° to 10° on the diffuse geometries and 45° ± 2° on the 45° geometries. Different geometries
may generate different results on the same specimen.
3.4
specularity
specular reflectance (3.6) on glossy, metallic and reflective specimens
caused by illumination, with the potential to disturb colour measurement
Note 1 to entry: Specular reflectance may be included “SPINC” (for matt specimens) or excluded “SPEX” (for reflective
specimens); different specularity may generate different results on the same specimen.
3.5
area of view
area and shape of the target covered by the instrument in
a single colour measurement
3.6
specular reflectance
reflection without diffusion, in accordance with the laws of optical reflection
Note 1 to entry: As in a mirror.
3.7
standardization
measurement of one or more calibrated materials with a colour
measuring instrument for the purpose of calculating a set of correction factors to be applied to subsequent
measurements
Note 1 to entry: Calibrating materials are normally a white tile for the white standardization, and a light trap or black
tile for the black standardization.
3.8
verification standard
stable material which is used for the purpose of confirming (or verifying) the validity
of an instrument standardization
Note 1 to entry: Colour measurements, which are made immediately following standardization, are compared with
the original measurements of one standard, or series of standards, to verify the correct standardization.

ISO/DIS 22700:2026(en)
IUF 474:2026(en)
4 Principle
The surface of a finished leather specimen is measured by reflectance methods in order to obtain a numerical
representation of the colour of the specimen. This numerical representation may have two different scopes:
— the definition of a certain colour by absolute chromatic coordinates or by definition of a specific spectral
distribution.
— the definition of a colour difference to define a specimen “pass/fail” boundary related to a reference
sample within a uniform perceptive tolerance.
Considering that the chromatic coordinates as well as spectral distribution specifications depend on the
instrument’s geometry and measuring conditions, all relevant data such as reference illuminant, photopic/
scotopic observer angle, instruments geometry and measurement area shall be reported.
Proper equipment set-up, standardization of the colour measuring instrument and presentation of the test
specimens to the instrument are recommended to achieve consistent, reliable and meaningful reflectance
measurement results.
In general, instrumental colour measurement procedures are dictated by the type of specimen to
be measured and the instrument with which it will be measured. Many types of colour measuring
instrumentation are available, differing in such features as area of view, illumination method and geometry.
Conflicting results will be obtained through comparisons of data acquired on instruments of different
designs. It is recommended that selected instruments conform with inter-instrumental agreement and
profiling protocols, to ensure acceptable absolute measurements on different instruments.
5 Apparatus and materials
5.1 Reflectance colour measuring instrument, for illuminating a specimen and measuring the amount
of light which is reflected from the surface of the specimen in the visible region of the spectrum (comprising
the wavelengths from 360 nm to 780 nm and including as a minimum the region from 400 nm to 700 nm).
Illumination is usually polychromatic (white light).
Reflectance colour measuring instruments may be broadly divided into two groups.
a) Spectrophotometers (typically diffuse/0, using polychromatic illumination) diffract and measure the
spectrum of light reflected from the specimen relative to a refer
...