Tissue paper and tissue products - Part 15: Determination of optical properties - Measurement of brightness and colour with C/2° (indoor daylight) illuminant (ISO 12625-15:2015)

This part of ISO 12625 specifies testing procedures for the instrumental determination of brightness and colour of tissue paper and tissue products viewed in indoor daylight conditions. It also gives specific instructions for the preparation of test pieces (single-ply, multi-ply products) and for the optical measurements of products, where special precautions may be necessary.

Tissue-Papier und Tissue-Produkte - Teil 15: Bestimmung von optischen Eigenschaften - Messung von Brightness und Farbe unter Lichtart C/2° (Tageslichtbedingungen in Innenräumen) (ISO 12625-15:2015)

Papier tissue et produits tissues - Partie 15: Détermination des propriétés optiques - Mesurage du degré de blancheur et de la coleur avec l'illuminant C/2° lumière du jour à l'intérieur) (ISO 12625-15:2015)

L'ISO 12625-15:2015 spécifie des procédures d'essai pour la détermination instrumentale du degré de blancheur et de la couleur des papiers tissue et des produits tissue observés dans des conditions de lumière du jour à l'intérieur. Elle donne également des instructions spécifiques pour la préparation des éprouvettes (produits à pli unique, produits multiplis) ainsi que pour les mesures optiques des produits, lorsque des précautions particulières peuvent se révéler nécessaires.

Tissue papir in proizvodi iz tissue papirja - 15. del: Ugotavljanje optičnih lastnosti - Merjenje beline in barve s svetilom C/2° (osvetlitev v prostoru) (ISO 12625-15:2015)

General Information

Status
Withdrawn
Public Enquiry End Date
19-Jan-2014
Publication Date
13-May-2015
Withdrawal Date
07-Dec-2022
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
01-Dec-2022
Due Date
24-Dec-2022
Completion Date
08-Dec-2022

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 12625-15:2015
01-junij-2015
7LVVXHSDSLULQSURL]YRGLL]WLVVXHSDSLUMDGHO8JRWDYOMDQMHRSWLþQLKODVWQRVWL
0HUMHQMHEHOLQHLQEDUYHVVYHWLORP&ƒ RVYHWOLWHYYSURVWRUX  ,62
Tissue paper and tissue products - Part 15: Determination of optical properties -
Measurement of brightness and colour with C/2° (indoor daylight) illuminant (ISO 12625-
15:2015)
Tissue-Papier und Tissue-Produkte - Teil 15: Bestimmung von optischen Eigenschaften -
Messung von Brightness und Farbe unter Lichtart C/2° (Tageslichtbedingungen in
Innenräumen) (ISO 12625-15:2015)
Papier tissue et produits tissues - Partie 15: Détermination des propriétés optiques -
Mesurage du degré de blancheur et de la coleur avec l'illuminant C/2° lumière du jour à
l'intérieur) (ISO 12625-15:2015)
Ta slovenski standard je istoveten z: EN ISO 12625-15:2015
ICS:
85.080.20 Tissue papir Tissue paper
SIST EN ISO 12625-15:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN ISO 12625-15:2015

---------------------- Page: 2 ----------------------

SIST EN ISO 12625-15:2015

EUROPEAN STANDARD
EN ISO 12625-15

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2015
ICS 85.060
English Version
Tissue paper and tissue products - Part 15: Determination of
optical properties - Measurement of brightness and colour with
C/2° (indoor daylight) illuminant (ISO 12625-15:2015)
Papier tissue et produits tissue - Partie 15: Détermination Tissue-Papier und Tissue-Produkte - Teil 15: Bestimmung
des propriétés optiques - Mesurage du degré de blancheur von optischen Eigenschaften - Messung von Brightness und
et de la couleur avec l'illuminant C/2° (lumière du jour à Farbe unter Lichtart C/2° (Tageslichtbedingungen in
l'intérieur) (ISO 12625-15:2015) Innenräumen) (ISO 12625-15:2015)
This European Standard was approved by CEN on 3 January 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-15:2015 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST EN ISO 12625-15:2015
EN ISO 12625-15:2015 (E)
Contents Page
Foreword .3

2

---------------------- Page: 4 ----------------------

SIST EN ISO 12625-15:2015
EN ISO 12625-15:2015 (E)
Foreword
This document (EN ISO 12625-15:2015) has been prepared by Technical Committee ISO/TC 6 “Paper, board
and pulps” in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” 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 August 2015, and conflicting national standards shall be withdrawn at
the latest by August 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 12625-15:2015 has been approved by CEN as EN ISO 12625-15:2015 without any
modification.
3

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SIST EN ISO 12625-15:2015

---------------------- Page: 6 ----------------------

SIST EN ISO 12625-15:2015
INTERNATIONAL ISO
STANDARD 12625-15
First edition
2015-02-15
Tissue paper and tissue products —
Part 15:
Determination of optical properties —
Measurement of brightness and colour
with C/2° (indoor daylight) illuminant
Papier tissue et produits tissue —
Partie 15: Détermination des propriétés optiques — Mesurage du
degré de blancheur et de la couleur avec l’illuminant C/2° (lumière du
jour à l’intérieur)
Reference number
ISO 12625-15:2015(E)
©
ISO 2015

---------------------- Page: 7 ----------------------

SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2015 – All rights reserved

---------------------- Page: 8 ----------------------

SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 3
5.1 Reflectometer or spectrophotometer . 3
5.2 Reference standard for calibration of the instrument . 3
5.3 Working standards . 3
6 Calibration . 4
7 Sampling . 4
8 Conditioning . 4
9 Preparation of test pieces . 5
10 Procedure. 5
10.1 General . 5
10.2 Measurement of C/2° brightness . 5
10.3 Measurement of (C/2°) colour . 5
11 Calculation . 6
11.1 C/2° brightness . 6
11.2 C/2° Colour. 6
11.2.1 Single values . 6
11.2.2 Mean value . 6
11.2.3 Dispersion of the results . 7
12 Test report . 7
Annex A (informative) Precision . 8
Bibliography .11
© ISO 2015 – All rights reserved iii

---------------------- Page: 9 ----------------------

SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
ISO 12625-15 was prepared by European Committee for Standardization (CEN) Technical Committee
CEN/TC 172 Pulp, paper and board, in collaboration with Technical Committee ISO/TC 6, Paper, board
and pulps, Subcommittee SC 2, Test methods for quality specifications for paper and board, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
ISO 12625 consists of the following parts, under the general title Tissue paper and tissue products:
— Part 1: General guidance on terms
— Part 3: Determination of thickness, bulking thickness, apparent bulk density and bulk
— Part 4: Determination of tensile strength, stretch at break and tensile energy absorption
— Part 5: Determination of wet tensile strength
— Part 6: Determination of grammage
— Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight)
— Part 8: Water-absorption time and water-absorption capacity, basket-immersion test method
— Part 9: Determination of ball burst strength
— Part 11: Determination of wet ball burst strength
— Part 12: Determination of tensile strength of perforated lines — Calculation of perforation efficiency
— Part 15: Determination of optical properties — Measurement of brightness and colour with C/2°
(indoor daylight)
— Part 16: Determination of optical properties — Opacity (paper backing) — Diffuse reflectance method
iv © ISO 2015 – All rights reserved

---------------------- Page: 10 ----------------------

SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

Introduction
Brightness and colour measurement may be performed under various illumination and observation
conditions. This part of ISO 12625 deals with C/2° conditions, which refer to an indoor daylight.
D65/10° conditions (outdoor daylight) are considered in ISO 12625-7. Although both standards deal
with brightness and colour, results obtained are usually different and do not correlate.
Optical measurements are affected by the geometry of the instruments used and by the texture of the
material. The design of the instrument to be used according to this part of ISO 12625, and the routine to
be adopted for its calibration are specified in ISO 2469 and ISO 2470-1.
The optical properties are related to the visual appearance of the material in a specified illumination condition.
Although optical properties are intrinsic properties of tissue paper, they are not functional properties.
Brightness is not to be confused with the optical property called CIE-whiteness, which is based on
reflectance data obtained over the full visible spectral range (VIS). In contrast, brightness is limited to
the blue region of VIS (visible spectrum).
As preferences for the properties to be specified can vary by country/market, three different test
methods for the determination of optical properties were developed:
— Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight);
— Part 15: Determination of optical properties — Measurement of brightness and colour with C/2°
(indoor daylight);
— Part 16: Determination of optical properties — Measurement of opacity (paper backing) — Diffuse
reflectance method.
© ISO 2015 – All rights reserved v

---------------------- Page: 11 ----------------------

SIST EN ISO 12625-15:2015

---------------------- Page: 12 ----------------------

SIST EN ISO 12625-15:2015
INTERNATIONAL STANDARD ISO 12625-15:2015(E)
Tissue paper and tissue products —
Part 15:
Determination of optical properties — Measurement of
brightness and colour with C/2° (indoor daylight) illuminant
1 Scope
This part of ISO 12625 specifies testing procedures for the instrumental determination of brightness
and colour of tissue paper and tissue products viewed in indoor daylight conditions. It also gives
specific instructions for the preparation of test pieces (single-ply, multi-ply products) and for the optical
measurements of products, where special precautions may be necessary.
NOTE The properties called D65 brightness and colour are measured with an instrument adjusted to a much
higher UV content than that specified in this part of ISO 12625. The measurements of D65 brightness and colour
are described in ISO 12625-7.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 2469, Paper, board and pulps — Measurement of diffuse radiance factor
ISO 2470-1:2009, Paper, board and pulps — Measurement of diffuse blue reflectance factor — Part 1: Indoor
daylight conditions (ISO brightness)
ISO 5631-1:2009, Paper and board — Determination of colour by diffuse reflectance — Part 1: Indoor
daylight conditions (C/2°)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
reflectance factor
R
ratio of the radiation reflected by a body to that reflected by the perfect diffuser under the same
conditions of illumination and detection
Note 1 to entry: The reflectance factor is expressed as a percentage.
Note 2 to entry: The reflectance factor is influenced by the backing if the body is translucent.
© ISO 2015 – All rights reserved 1

---------------------- Page: 13 ----------------------

SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

3.2
diffuse reflectance radiance factor
R
ratio of the reflection from a body to that from the perfect reflecting diffuser under the same conditions
of diffuse illumination and normal detection
Note 1 to entry: The ratio is often expressed as a percentage.
[SOURCE: ISO 2469:2007]
3.3
intrinsic reflectance factor
R

diff
...

SLOVENSKI STANDARD
oSIST prEN ISO 12625-15:2014
01-januar-2014
7LVVXHSDSLULQSURL]YRGLL]WLVVXHSDSLUMDGHO'RORþHYDQMHRSWLþQLKODVWQRVWL
0HUMHQMHEHOLQHLQEDUYHVVYHWLORP&ƒ RVYHWOLWHYYSURVWRUX  ,62',6

Tissue paper and tissue products - Part 15: Determination of optical properties -
Measurement of brightness and colour with C/2° (indoor daylight) illuminant (ISO/DIS
12625-15:2013)
Tissue-Papier und Tissue-Produkte - Teil 15: Bestimmung von optischen Eigenschaften -
Messung von Brightness und Farbe unter Lichtart C/2° (Tageslichtbedingungen in
Innenräumen) (ISO/DIS 12625-15:2013)
Papier tissue et produits tissues - Partie 15: Détermination des propriétés optiques -
Mesurage du degré de blancheur et de la coleur avec l'illuminant C/2° lumière du jour à
l'intérieur) (ISO/DIS 12625-15:2013)
Ta slovenski standard je istoveten z: prEN ISO 12625-15
ICS:
85.080.20 Tissue papir Tissue paper
oSIST prEN ISO 12625-15:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 12625-15:2014

---------------------- Page: 2 ----------------------
oSIST prEN ISO 12625-15:2014
DRAFT INTERNATIONAL STANDARD
ISO/DIS 12625-15
ISO/TC 6/SC 2 Secretariat: SIS
Voting begins on: Voting terminates on:
2013-08-29 2014-01-29
Tissue paper and tissue products —
Part 15:
Determination of optical properties — Measurement
of brightness and colour with C/2° (indoor daylight)
illuminant
Papier tissue et produits tissues —
Partie 15: Détermination des propriétés optiques — Mesurage du degré de blancheur et de la coleur avec
l’illuminant C/2° (éclairage intérieur)
ICS: 85.060
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the European Committee for Standardization
(CEN), and processed under the CEN lead mode of collaboration as defined in the
Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 12625-15:2013(E)
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. ISO 2013

---------------------- Page: 3 ----------------------
oSIST prEN ISO 12625-15:2014
ISO/DIS 12625-15:2013(E)

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as
permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract
from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,
electronic, photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2013 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST prEN ISO 12625-15:2014
ISO/DIS 12625-15
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle. 3
5 Apparatus . 3
5.1 Reflectometer or spectrophotometer . 3
5.2 Reference standard for calibration of the instrument . 3
5.3 Working standards . 3
6 Calibration . 4
7 Sampling. 4
8 Conditioning . 4
9 Preparation of test pieces. 5
10 Procedure . 5
10.1 General . 5
10.2 Measurement of C/2° brightness . 5
10.3 Measurement of (C/2°) colour . 5
11 Calculation . 6
11.1 C/2° brightness . 6
11.2 C/2° Colour . 6
11.2.1 Single values . 6
11.2.2 Mean value . 6
11.2.3 Dispersion of the results . 7
12 Test report . 7
Annex A (informative) Precision . 8
A.1 General . 8
A.2 Brightness . 9
A.3 Colour . 11
Bibliography . 12

© ISO 2013 – All rights reserved iii

---------------------- Page: 5 ----------------------
oSIST prEN ISO 12625-15:2014
ISO/DIS 12625-15
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 12625-15 was prepared by European Committee for Standardisation (CEN) Technical Committee
CEN/TC 172 Pulp, paper and board, in collaboration with Technical Committee ISO/TC 6, Paper, board and
pulps, Subcommittee SC 2, Test methods for quality specifications for paper and board, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
ISO 12625 consists of the following parts, under the general title Tissue paper and tissue products:
 Part 1: General guidance on terms;
 Part 3: Determination of thickness, bulking thickness, apparent bulk density and bulk;
 Part 4: Determination of tensile strength, stretch at break and tensile energy absorption;
 Part 5: Determination of wet tensile strength;
 Part 6: Determination of grammage;
 Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight);
 Part 8: Water-absorption time and water-absorption capacity; basket-immersion test method;
 Part 9: Determination of ball burst strength;
 Part 11: Determination of wet ball burst strength;
 Part 12: Determination of tensile strength of perforated lines — Calculation of perforation efficiency;
 Part 15: Determination of optical properties — Measurement of brightness and colour with C/2° (indoor
daylight);
 Part 16: Determination of optical properties — Opacity (paper backing) — Diffuse reflectance method.
iv © ISO 2013 – All rights reserved

---------------------- Page: 6 ----------------------
oSIST prEN ISO 12625-15:2014
ISO/DIS 12625-15
Introduction
Brightness and colour measurement may be performed under various illumination and observation conditions.
This International Standard deals with C/2° conditions, which refer to an indoor daylight.
D65/10° conditions (outdoor daylight) are considered in Part 7. Although both standards deal with brightness
and colour, results obtained are usually different and do not correlate.
Optical measurements are affected by the geometry of the instruments used and by the texture of the
material. The designs of the instrument to be used according to this part of ISO 12625, and the routine to be
adopted for its calibration are specified in ISO 2469 and ISO 2470-1.
The optical properties are related to the visual appearance of the material in a specified illumination condition.
Therefore, although optical properties are intrinsic properties of tissue paper, they are not functional
properties.
Brightness shall not be confuse with the optical property called CIE-whiteness that is based on reflectance
data obtained over the full visible spectral range (VIS) in contrast to three measurement of brightness which is
limited to the blue region of VIS.
Due to the importance for some countries three different test methods for the determination of optical
properties were developed:
 Part 7: Determination of optical properties – Measurement of brightness and colour with D65/10° (outdoor
daylight);
 Part 15: Determination of optical properties – Measurement of brightness and colour with C/2° (indoor
daylight);
 Part 16: Determination of optical properties – Measurement of opacity (paper backing) – Diffuse
reflectance method;






© ISO 2013 – All rights reserved v

---------------------- Page: 7 ----------------------
oSIST prEN ISO 12625-15:2014

---------------------- Page: 8 ----------------------
oSIST prEN ISO 12625-15:2014
DRAFT INTERNATIONAL STANDARD ISO/DIS 12625-15

Tissue paper and tissue products — Part 15: Determination of
optical properties - Measurement of brightness and colour with
C/2° (indoor daylight)
1 Scope
This part of ISO 12625 specifies testing procedures for the instrumental determination of brightness and
colour of tissue paper and tissue products viewed in indoor daylight conditions. It also gives specific
instructions for the preparation of test pieces (single-ply, multi-ply products) and for the optical measurements
of products, where special precautions may be necessary.
NOTE The properties called D65 brightness and colour are measured with an instrument adjusted to a much higher
UV content than that specified in this part of ISO 12625. The measurements of D65 brightness and colour are described in
ISO 12625-7.
2 Normative references
The following referenced documents are indispensable for the application 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 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps; standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 2469:2007, Paper, board and pulps — Measurement of diffuse radiance factor
ISO 2470-1:2009, Paper, board and pulps — Measurement of diffuse blue reflectance factor — Part 1: Indoor
daylight conditions (ISO brightness)
ISO 5631-1:2009, Paper and board — Determination of colour by diffuse reflectance — Part 1: Indoor
daylight conditions (C/2 degrees)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
reflectance factor
R
ratio of the radiation reflected by a body to that reflected by the perfect diffuser under the same conditions of
illumination and detection
NOTE 1 to entry The reflectance factor is expressed as a percentage.
NOTE 2 to entry The reflectance factor is influenced by the backing if the body is translucent.
© ISO 2013 – All rights reserved 1

---------------------- Page: 9 ----------------------
oSIST prEN ISO 12625-15:2014
ISO/DIS 12625-15
3.2
diffuse reflectance radiance factor
R
ratio of the reflection from a body to that from the perfect reflecting diffuser under the same conditions of
diffuse illumination and normal detection
NOTE 1 to entry The ratio is often expressed as a percentage.
NOTE 2 to entry [Source ISO 2469:2007].
3.3
intrinsic reflectance factor
R

diffuse reflectance factor of a layer or pad of material thick enough to be opaque, i.e. such that increasing the
thickness of the pad by doubling the number of sheets results in no change in the measured reflectance factor
NOTE 1 to entry [Source ISO 2469:2007].
3.4
C/2° brightness
Intrinsic reflectance factor measured with a reflectometer having the characteristics described in ISO 2469,
equipped with a filter or corresponding function having an effective wavelength of 457 nm (and a half
bandwidth of 44 nm, and adjusted so that the UV content of the irradiation incident upon the test piece
corresponds to that of the CIE illuminant C.
NOTE 1 to entry The filter function is described more fully by the weighing function factors given in ISO 2470-1.
3.5
tristimulus values
X, Y, Z
amounts of the three reference colour stimuli, in a given chromatic system, required to match the stimulus
considered
NOTE 1 to entry In this part of 12625 as in ISO 5631-1 the CIE standard illuminant C and the CIE 1931 (2°) standard
observer are used to define the trichromatic system.
NOTE 2 to entry No subscript is applied to conform to the CIE convention that tristimulus values have no subscript
when the CIE 1931 (2°) standard observer is used [the subscript 10 is applied for tristimulus values that are obtained using
the CIE 1964 (10°) standard observer].
NOTE 3 to entry [Source ISO 5631-1:2009].
3.6
c/2° colour
Is defined as CIELAB colour space: L*, a* and b* coordinates of the sample according to the CIELAB 1976
system, corresponding to the CIE standard illuminant C, described in ISO 11664-2 and the CIE 1964
supplementary standard colorimetric 2° observer, described in ISO 11664-1, determined by the
measurements obtained under the conditions specified in ISO 5631-1.
NOTE to entry The quantity L* is a measure of the lightness of the test piece, where L* = 0 corresponds to black and
L* = 100 is defined by the perfect reflecting diffuser. Visually, the quantities a* and b* represent respectively the red-green
and yellow-blue axes in colour space, such that
+a* is a measure
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