prEN ISO 7979

SLOVENSKI STANDARD
01-september-2024
Usnje - Preskušanje barvne obstojnosti - Barvna obstojnost v hidroalkoholni
zmesi (ISO/DIS 7979:2024)
Leather - Tests for colour fastness - Colour fastness to hydroalcoholic mixtures (ISO/DIS
7979:2024)
Leder - Farbechtheitsprüfung - Bestimmung der Farbechtheit gegenüber
hydroalkoholischen Desinfektionsmitteln (ISO/DIS 7979:2024)
Ta slovenski standard je istoveten z: prEN ISO 7979
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 7979
IULTCS
IUF 428
IULTCS
Leather – Tests for colour fastness
Secretariat: ISO
– Colour fastness to hydroalcoholic
mixtures
Voting begins on:
2024-06-14
ICS: 59.140.30
Voting terminates on:
2024-09-06
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.
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NATIONAL REGULATIONS.
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
Reference numbers
ISO/DIS 7979:2024(en)
IULTCS/IUF 428:2024(en)
DRAFT
ISO/DIS 7979:2024(en)
International
Standard
ISO/DIS 7979
IULTCS
IUF 428
IULTCS
Leather – Tests for colour fastness
Secretariat: ISO
– Colour fastness to hydroalcoholic
mixtures
Voting begins on:
ICS: 59.140.30
Voting terminates on:
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 2024
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
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RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Reference numbers
Published in Switzerland ISO/DIS 7979:2024(en)
IULTCS/IUF 428:2024(en)
ii
ISO/DIS 7979:2024(en)
IULTCS/IUF 428:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Equipment and materials . 2
6 Procedure . 3
6.1 General .3
6.2 Conditioning and test atmosphere conditions .3
6.3 Test media .3
6.3.1 Preparation of the test media .3
6.3.2 Standard Test Medium .3
6.4 Method 1, surface wetting . .4
6.5 Method 2, linear rubbing test with hydroalcoholic mixtures .4
6.5.1 Procedure 2, Method A Test .4
6.5.2 Procedure 2, Method B Test .4
6.6 Cleaning of test specimens .5
7 Evaluation . 5
8 Test report . 6
Annex A (informative) Visual evaluation scheme . 7

iii
ISO/DIS 7979:2024(en)
IULTCS/IUF 428:2024(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 Tests 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.
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 7979:2024(en)
DRAFT International Standard
IULTCS/IUF 428:2024(en)
Leather – Tests for colour fastness – Colour fastness to
hydroalcoholic mixtures
1 Scope
This document specifies methods for determining the fastness of the surface of leather to hydroalcoholic
mixtures.
It is applicable to all kinds of leather.
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 3696, Water for analytical laboratory use — Specification and test methods
ISO 105-A02, Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour
ISO 105-A03, Textiles — Tests for colour fastness — Part A03: Grey scale for assessing staining
ISO 105-F09, Textiles — Tests for colour fastness — Part F09: Specification for cotton rubbing cloth
ISO 11640, Leather — Tests for colour fastness — Colour fastness to cycles of to-and-fro rubbing
ISO 12947-1, Textiles — Determination of the abrasion resistance of fabrics by the Martindale method — Part 1:
Martindale abrasion testing apparatus
ISO 15115, Leather — Vocabulary
ISO 20433, Leather — Tests for colour fastness — Colour fastness to crocking
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 ISO 15115, 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
disinfectant
germicidal substance applied to objects to reduce the number of microorganisms on them

ISO/DIS 7979:2024(en)
IULTCS/IUF 428:2024(en)
3.2
hydroalcoholic mixtures
combination of substances containing alcohols and water
3.3
test medium
hydroalcoholic mixtures used in the test methods
4 Principle
This method describes a way of exposing the leather surface to the influence of hydroalcoholic mixtures
under the specified conditions and of evaluating it by visual and, if required, instrumental inspection.
The following test methods may be selected depending on the frequency and type of use of hydroalcoholic
mixtures in practice:
Method 1 - Surface wetting using a fabric wetted with the respective test medium.
Method 2 - Linear abrasion test of the surface to be assessed against a wool felt or cotton fabric soaked in the
respective test medium.
5 Equipment and materials
5.1 Distilled water (quality 3 according to ISO 3696).
5.2 Pipettes for applying the liquids, error limit at most 0,1 ml.
5.3 Petri dish, large with a diameter of 80 mm and a dish height of 15 mm.
5.4 Cotton cloth according to ISO 105-F09, dimensions: approximately (50 x 50) mm pieces.
5.5 White wool felt according to ISO 11640.
5.6 Cleaning agent, sodium lauryl ether sulfate (CAS 9004-82-4), 0,5 % solution in water.
5.7 Gray scale according to ISO 105-A02.
5.8 Gray s
...