oSIST prEN ISO 18451-2:2026

SLOVENSKI STANDARD
01-maj-2026
Pigmenti, barvila in polnila - Terminologija - 2. del: Razvrstitev sredstev za
obarvanje glede na barvne in kemijske lastnosti (ISO/DIS 18451-2:2026)
Pigments, dyestuffs and extenders - Vocabulary - Part 2: Classification of colouring
materials according to colouristic and chemical aspects (ISO/DIS 18451-2:2026)
Pigmente, Farbstoffe und Füllstoffe - Begriffe - Teil 2: Einteilung nach koloristischen und
chemischen Gesichtspunkten (ISO/DIS 18451-2:2026)
Pigments, colorants et matières de charge - Vocabulaire - Partie 2: Classification des
matières colorantes selon leurs aspects colorimétriques et chimiques (ISO/DIS 18451-
2:2026)
Ta slovenski standard je istoveten z: prEN ISO 18451-2
ICS:
01.040.87 Industrija barv (Slovarji) Paint and colour industries
(Vocabularies)
87.060.10 Pigmenti in polnila Pigments and extenders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 18451-2
ISO/TC 256
Pigments, dyestuffs and
Secretariat: DIN
extenders — Vocabulary —
Voting begins on:
Part 2: 2026-03-16
Classification of colouring materials
Voting terminates on:
2026-06-08
according to colouristic and
chemical aspects
ICS: 87.060.10; 01.040.87
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
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Reference number
ISO/DIS 18451-2:2026(en)
DRAFT
ISO/DIS 18451-2:2026(en)
International
Standard
ISO/DIS 18451-2
ISO/TC 256
Pigments, dyestuffs and
Secretariat: DIN
extenders — Vocabulary —
Voting begins on:
Part 2:
2026-03-16
Classification of colouring materials
Voting terminates on:
2026-06-08
according to colouristic and
chemical aspects
ICS: 87.060.10; 01.040.87
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
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Published in Switzerland Reference number
ISO/DIS 18451-2:2026(en)
ii
ISO/DIS 18451-2:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification of inorganic and organic colouring materials in accordance with
colouristic aspects . 1
5 Classification of inorganic and organic colouring materials in accordance with chemical
aspects . 8
Bibliography .15

iii
ISO/DIS 18451-2:2026(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 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 Technical Committee ISO/TC 256, Pigments, dyestuffs and extenders.
This third edition cancels and replaces the second edition (ISO 18451-2:2018), which has been technically
revised. The changes compared to the previous edition are as follows:
— in Table 1, for manganese ferrite black (4.1.1.3) the colour index “Pigment Black 33” has been added;
— in Table 2, for ion manganese brown (5.1.1.3) the colour index “Pigment Bown 7 + 8” has been changed
to “Pigment Brown 43”, and the stoichiometric formula has been modified to (Fe,Mn) O ;
2 3
— in Table 2, for ion manganese black (5.1.1.3) the stoichiometric formula has been modified to
(Fe,Mn) O ∙ (Fe,Mn) O ;
2 3 3 4
— the colour range of isoindolinone (5.2.1.5) and perylene (5.2.2.2) has been corrected.
A list of all parts in the ISO 18451 series can be found on the ISO website.
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 18451-2:2026(en)
Introduction
In accordance with ISO 18451-1, it depends on the individual application as to whether a substance is to be
considered as a pigment or as an extender. Substances like aluminium silicate, barium sulfate and calcium
carbonate are taken into consideration in Clauses 4 and 5.
In addition to the examples of the colouring materials, the designation in accordance with the Colour
1)[1]
Index has been included. However, it is to be noted that for a number of the given designations of
colouring materials (which are partly collective designations) not only one designation in accordance with
the Colour Index is possible, even if in this document only one Colour Index designation is given.
In the “Classification scheme” in Clause 4, some spaces are empty. Corresponding colouring materials are
either without practical importance or they do not exist for physical reasons.
Inorganic dyestuffs, e.g. those for use with enamel, glass, ceramics and food, have been only mentioned in
Clauses 4 and 5 but not classified in accordance with certain aspects. The reason for this is that up to now,
such colouring materials are excluded from the work of ISO/TC 256.
1) The Colour Index (briefly: C.I.) is a work of reference existing since 1925, and comprising all usual colouring materials
and dyestuff chemicals being used as their basis. It is accepted as a standard work in the field of pigment and dyestuff
chemistry.
v
DRAFT International Standard ISO/DIS 18451-2:2026(en)
Pigments, dyestuffs and extenders — Vocabulary —
Part 2:
Classification of colouring materials according to colouristic
and chemical aspects
1 Scope
This document applies to the industry producing colouring materials and the consumer who uses the
products of this industry. In this document, the colouring materials are classified in accordance with
colouristic and chemical aspects.
Some dyestuffs for use in the ceramics and food industries are listed as examples.
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 18451-1, Pigments, dyestuffs and extenders — Vocabulary — Part 1: General terms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 18451-1 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/
4 Classification of inorganic and organic colouring materials in accordance with
colouristic aspects
Inorganic and organic colouring materials are classified in accordance with colouristic aspects as given in
Figure 1.
ISO/DIS 18451-2:2026(en)
a
See Introduction.
b
Corresponding products (“organic white pigments”) are at present without practical importance.
c
Corresponding products (“organic white dyestuffs”) do not exist for physical reasons.
d
Corresponding products (“organic effect dyestuffs”) do not exist for physical reasons.
Figure 1 — Classification of inorganic and organic colouring materials in accordance with
colouristic aspects
The above classification is based on optical effects the reasons of which are given in the following.

ISO/DIS 18451-2:2026(en)
White pigments The optical effect is based on light scattering, independent on the wavelength.
Coloured The optical effect is based on light absorption, dependent on the wavelength, com-
pigments bined with light scattering.
Coloured The optical effect is based on light absorption, dependent on the wavelength.
dyestuffs
Black The optical effect is based on light absorption, independent on the wavelength, in the
colouring visual range of light.
materials
Effect pigments The optical effect is based at least on one of the following effects:
— in the case of metallic flake pigments on the directed reflectance of mainly
flat shaped and aligned metallic pigment particles;
— in the case of nacreous pigments on the directed reflectance of mainly flat
shaped and aligned transparent small plates;
— in the case of interference pigments on the phenomenon of light interference.
Luminous The optical effect is based on their ability to absorb radiation and to emit it as light
colouring of greater wavelength without delay with regard to time (fluorescence) or with delay
materials with regard to time (phosphorescence).
Examples regarding the classification in accordance with colouristic aspects are given in Table 1.
Table 1 — Classification of inorganic and organic colouring materials in accordance with colouristic
aspects
a
No. Colouring material Colour index
4.1 Inorganic colouring materials
4.1.1 Inorganic pigments
4.1.1.1 Inorganic white pigments
a
Aluminium silicate Pigment White 19 77004
a
Barium sulfate Pigment White 21 77120
a
Calcium carbonate Pigment White 18 77220
Lithopone Pigment White 5 77115
Titanium dioxide Pigment White 6 77891
Zinc oxide/zinc white Pigment White 4 77947
Zinc sulfide Pigment White 7 77975
4.1.1.2 Inorganic coloured pigments
Bismuth vanadate Pigment Yellow 184 771740
Cadmium yellow Pigment Yellow 37 77199
Chromium yellow Pigment Yellow 34 77603
Chromium titanium yellow Pigment Brown 24 77310
Iron oxide yellow Pigment Yellow 42 77492
Nickel titanium yellow Pigment Yellow 53 77788
b
Praseodymium yellow Pigment Yellow 159 77997
Cadmium orange Pigment Orange 20 77202
Molybdate orange Pigment Red 104 77605
Titanium zinc tin oxide Pigment Orange 82
Cadmium red Pigment Red 108 77202

ISO/DIS 18451-2:2026(en)
TTabablele 1 1 ((ccoonnttiinnueuedd))
a
No. Colouring material Colour index
Cerium sulfide Pigment Red 265 77283 : 2
Iron oxide red Pigment Red 101 77491
Molybdate red Pigment Red 104 77605
Ultramarine red Pigment Violet 15 77007
b
Zirconium iron pink Pigment Red 232 77996
Manganese violet Pigment Violet 16 77742
Ultramarine violet Pigment Violet 15 77007
Cobalt blue Pigment Blue 28 77346
Iron blue Pigment Blue 27 77510
Ultramarine blue Pigment Blue 29 77007
b
Vanadium blue Pigment Blue 71 77998
Chromium oxide green Pigment Green 17 77288
Cobalt green Pigment Green 50 77377
Chromium iron brown Pigment Brown 29 77500
Iron oxide brown Pigment Brown 6 77691
Manganese brown Pigment Yellow 164 77899
Manganese titanium rutile Pigment Yellow 164
Zinc iron brown Pigment Yellow 119 77496
Umber Pigment Brown 7 77491
4.1.1.3 Inorganic black pigments
Cobalt chromium iron black Pigment Black 27 77502
Iron oxide
...