Graphic technology -- Colour and transparency of printing ink sets for four-colour printing

ISO 2846-2:2007 specifies the colour and transparency to be produced by inks intended for four-colour coldset web offset printing when printed under specified conditions on a printability tester. It also describes the test method to ensure conformance. ISO 2846-2:2007 is not applicable to fluorescent inks and does not specify pigments (or spectral reflectance) so as not to preclude the use of suitable future pigment combinations and still claim compliance with its colorimetric requirements.

Technologie graphique -- Couleur et transparence des gammes d'encre d'impression en quadrichromie

Grafična tehnologija - Barvni učinki in prozornost procesnih tiskarskih barv za štiribarvni tisk - 2. del: Ofsetni tisk na rotacijah s hladnim sušenjem (cold-set)

General Information

Status
Published
Publication Date
05-Dec-2007
Current Stage
9093 - International Standard confirmed
Start Date
07-Jun-2021

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INTERNATIONAL ISO
STANDARD 2846-2
Second edition
2007-12-15
Graphic technology — Colour and
transparency of printing ink sets for four-
colour printing —
Part 2:
Coldset offset lithographic printing
Technologie graphique — Couleur et transparence des gammes
d'encre d'impression en quadrichromie —
Partie 2: Impression lithographique offset rotatif coldset
Reference number
ISO 2846-2:2007(E)
ISO 2007
---------------------- Page: 1 ----------------------
ISO 2846-2:2007(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2007

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing 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 2007 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 2846-2:2007(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope ......................................................................................................................................................1

2 Normative references ............................................................................................................................1

3 Terms and definitions ...........................................................................................................................1

4 Test method............................................................................................................................................2

4.1 Principle..................................................................................................................................................2

4.2 Test print preparation............................................................................................................................2

5 Requirements for colour, transparency and ink film thickness range.............................................3

5.1 Colour .....................................................................................................................................................3

5.2 Transparency characteristics...............................................................................................................4

5.3 Ink film thickness range........................................................................................................................4

Annex A (normative) Reference substrate .......................................................................................................5

Annex B (informative) Detailed explanation of testing including examples .................................................6

Annex C (informative) Spectral data..................................................................................................................9

Bibliography ......................................................................................................................................................11

© ISO 2007 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 2846-2:2007(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.

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 2846-2 was prepared by Technical Committee ISO/TC 130, Graphic technology.

This second edition cancels and replaces the first edition (ISO 2846-2:2000), of which Clauses 4 and 5 have

been technically revised and the colorimetric properties of the inks were adjusted to be compatible with actual

[1]

commercial requirements and to the process standard ISO 12647-3 . Details for test print preparation, which

are now specified in ISO 2834-1, have been deleted.

ISO 2846 consists of the following parts, under the general title Graphic technology — Colour and

transparency of printing ink sets for four-colour printing:
⎯ Part 1: Sheet-fed and heat-set web offset lithographic printing
⎯ Part 2: Coldset offset lithographic printing
⎯ Part 3: Publication gravure printing
⎯ Part 4: Screen printing
⎯ Part 5: Flexographic printing
iv © ISO 2007 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 2846-2:2007(E)
Introduction

The initial draft of ISO 2846-2 was prepared by ISO/TC 130 for materials and process control. They examined

the colorimetric properties of commercial coldset web offset inks from around the world and found that a single

set of colour coordinates could adequately represent these, within reasonable tolerances. Since the initial

publication of this part of ISO 2846, additional coordination between the various national bodies participating

in ISO/TC 130 has suggested that some minor refinements of the colorimetric aims would make them more

[1]

compatible with actual commercial printing requirements and to the process standard ISO 12647-3 .

This part of ISO 2846 will allow printers to obtain sets of process inks from various sources which will produce

a similar colour when printed on the reference substrate at the appropriate film thickness. This will allow colour

separations for coldset web offset printing to be based on known colour standards. The colorimetric

characteristics specified in this part of ISO 2846 may only be obtained when the inks are printed on the

reference substrate. However, similarity of two inks on the reference substrate will ensure similarity on another

substrate.
© ISO 2007 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 2846-2:2007(E)
Graphic technology — Colour and transparency of printing ink
sets for four-colour printing —
Part 2:
Coldset offset lithographic printing
1 Scope

This part of ISO 2846 specifies the colour and transparency to be produced by inks intended for four-colour

coldset web offset printing when printed under specified conditions on a printability tester. It also describes the

test method to ensure conformance.

This part of ISO 2846 is not applicable to fluorescent inks and does not specify pigments (or spectral

reflectance) so as not to preclude the use of future suitable pigment combinations and still claim compliance

with its colorimetric requirements.
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 536, Paper and board — Determination of grammage

ISO 2471, Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method

ISO 2834-1, Graphic technology — Laboratory preparation of test prints — Part 1: Paste inks

ISO 8791-4, Paper and board — Determination of roughness/smoothness (air leak methods) — Part 4: Print-

surf method

ISO 13655, Graphic technology — Spectral measurement and colorimetric computation for graphic arts

images

ANSI/CGATS.5:2003, Graphic technology — Spectral measurement and colorimetric computation for graphic

arts images
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
coldset printing
web offset printing without accelerated drying
NOTE Ink sets by absorption into the substrate.
© ISO 2007 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 2846-2:2007(E)
3.2
standard ink

ink, intended for four-colour printing, which, when printed on the reference substrate and within the applicable

range of ink film thicknesses, complies to the colorimetric and transparency specifications of this part of

ISO 2846
3.3
primary colours
colours of individual prints from yellow, magenta and cyan inks

NOTE If the prints are produced as specified in this part of ISO 2846 and conform to the colorimetric characteristics

specified, they are standard primary colours.
3.4
transparency

ability of an ink film to transmit light, generally expressed as some measure of the unwanted scattering

3.5
transparency measurement value

reciprocal of the slope of the regression line between ink film thickness and colour difference for overprints of

chromatic inks over black
4 Test method
4.1 Principle

Each ink is printed on the reference substrate described in Annex A at a range of ink film thicknesses. The

colours which result are measured colorimetrically.

Transparency is evaluated by printing each of the three primary colours on a black substrate at a range of film

thicknesses. The CIELAB colour difference is determined for each sample, between the printed and unprinted

black, and the linear regression coefficient (slope of the regression line) between ink film thickness and colour

difference is calculated for each colour.

For a detailed description of procedures, together with examples, see the informative Annex B.

4.2 Test print preparation
4.2.1 Prints for colorimetric evaluation

For each of the inks to be evaluated, a number of test prints shall be made using a printability tester, each

produced at a different ink film thickness in accordance with the conditions specified in ISO 2834-1. They shall

be made on the reference substrate as specified in Annex A. The sample material shall be kept in the dark

under standard conditions of 23 °C and 50 % RH. The range of ink film thicknesses produced shall

encompass that specified in 5.3. In cases where the approximate ink film thickness is known to result in the

closest match of the target colorimetric values, a minimum of three prints shall be made. Otherwise, a

minimum number of five prints should be made covering the full range of specified film thicknesses.

4.2.2 Prints for transparency evaluation

Test prints for transparency evaluation shall be produced by printing the inks to be tested on a black substrate

using a printability tester. Measurements of the CIELAB values of the black substrate shall be made prior to

overprinting. The black shall have a lightness (L*) less than 30 when
...

SLOVENSKI STANDARD
SIST ISO 2846-2:2008
01-junij-2008
1DGRPHãþD
SIST ISO 2846-2:2005
*UDILþQDWHKQRORJLMD%DUYQLXþLQNLLQSUR]RUQRVWSURFHVQLKWLVNDUVNLKEDUY]D

ãWLULEDUYQLWLVNGHO2IVHWQLWLVNQDURWDFLMDKVKODGQLPVXãHQMHP FROGVHW

Graphic technology - Colour and transparency of printing ink sets for four-colour printing

- Part 2: Coldset offset lithographic printing
Ta slovenski standard je istoveten z: ISO 2846-2:2007
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
87.080 Barvila. Tiskarske barve Inks. Printing inks
SIST ISO 2846-2:2008 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 2846-2:2008
---------------------- Page: 2 ----------------------
SIST ISO 2846-2:2008
INTERNATIONAL ISO
STANDARD 2846-2
Second edition
2007-12-15
Graphic technology — Colour and
transparency of printing ink sets for four-
colour printing —
Part 2:
Coldset offset lithographic printing
Technologie graphique — Couleur et transparence des gammes
d'encre d'impression en quadrichromie —
Partie 2: Impression lithographique offset rotatif coldset
Reference number
ISO 2846-2:2007(E)
ISO 2007
---------------------- Page: 3 ----------------------
SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2007

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing 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 2007 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope ......................................................................................................................................................1

2 Normative references ............................................................................................................................1

3 Terms and definitions ...........................................................................................................................1

4 Test method............................................................................................................................................2

4.1 Principle..................................................................................................................................................2

4.2 Test print preparation............................................................................................................................2

5 Requirements for colour, transparency and ink film thickness range.............................................3

5.1 Colour .....................................................................................................................................................3

5.2 Transparency characteristics...............................................................................................................4

5.3 Ink film thickness range........................................................................................................................4

Annex A (normative) Reference substrate .......................................................................................................5

Annex B (informative) Detailed explanation of testing including examples .................................................6

Annex C (informative) Spectral data..................................................................................................................9

Bibliography ......................................................................................................................................................11

© ISO 2007 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 2846-2:2008
ISO 2846-2:2007(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.

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 2846-2 was prepared by Technical Committee ISO/TC 130, Graphic technology.

This second edition cancels and replaces the first edition (ISO 2846-2:2000), of which Clauses 4 and 5 have

been technically revised and the colorimetric properties of the inks were adjusted to be compatible with actual

[1]

commercial requirements and to the process standard ISO 12647-3 . Details for test print preparation, which

are now specified in ISO 2834-1, have been deleted.

ISO 2846 consists of the following parts, under the general title Graphic technology — Colour and

transparency of printing ink sets for four-colour printing:
⎯ Part 1: Sheet-fed and heat-set web offset lithographic printing
⎯ Part 2: Coldset offset lithographic printing
⎯ Part 3: Publication gravure printing
⎯ Part 4: Screen printing
⎯ Part 5: Flexographic printing
iv © ISO 2007 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
Introduction

The initial draft of ISO 2846-2 was prepared by ISO/TC 130 for materials and process control. They examined

the colorimetric properties of commercial coldset web offset inks from around the world and found that a single

set of colour coordinates could adequately represent these, within reasonable tolerances. Since the initial

publication of this part of ISO 2846, additional coordination between the various national bodies participating

in ISO/TC 130 has suggested that some minor refinements of the colorimetric aims would make them more

[1]

compatible with actual commercial printing requirements and to the process standard ISO 12647-3 .

This part of ISO 2846 will allow printers to obtain sets of process inks from various sources which will produce

a similar colour when printed on the reference substrate at the appropriate film thickness. This will allow colour

separations for coldset web offset printing to be based on known colour standards. The colorimetric

characteristics specified in this part of ISO 2846 may only be obtained when the inks are printed on the

reference substrate. However, similarity of two inks on the reference substrate will ensure similarity on another

substrate.
© ISO 2007 – All rights reserved v
---------------------- Page: 7 ----------------------
SIST ISO 2846-2:2008
---------------------- Page: 8 ----------------------
SIST ISO 2846-2:2008
INTERNATIONAL STANDARD ISO 2846-2:2007(E)
Graphic technology — Colour and transparency of printing ink
sets for four-colour printing —
Part 2:
Coldset offset lithographic printing
1 Scope

This part of ISO 2846 specifies the colour and transparency to be produced by inks intended for four-colour

coldset web offset printing when printed under specified conditions on a printability tester. It also describes the

test method to ensure conformance.

This part of ISO 2846 is not applicable to fluorescent inks and does not specify pigments (or spectral

reflectance) so as not to preclude the use of future suitable pigment combinations and still claim compliance

with its colorimetric requirements.
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 536, Paper and board — Determination of grammage

ISO 2471, Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method

ISO 2834-1, Graphic technology — Laboratory preparation of test prints — Part 1: Paste inks

ISO 8791-4, Paper and board — Determination of roughness/smoothness (air leak methods) — Part 4: Print-

surf method

ISO 13655, Graphic technology — Spectral measurement and colorimetric computation for graphic arts

images

ANSI/CGATS.5:2003, Graphic technology — Spectral measurement and colorimetric computation for graphic

arts images
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
coldset printing
web offset printing without accelerated drying
NOTE Ink sets by absorption into the substrate.
© ISO 2007 – All rights reserved 1
---------------------- Page: 9 ----------------------
SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
3.2
standard ink

ink, intended for four-colour printing, which, when printed on the reference substrate and within the applicable

range of ink film thicknesses, complies to the colorimetric and transparency specifications of this part of

ISO 2846
3.3
primary colours
colours of individual prints from yellow, magenta and cyan inks

NOTE If the prints are produced as specified in this part of ISO 2846 and conform to the colorimetric characteristics

specified, they are standard primary colours.
3.4
transparency

ability of an ink film to transmit light, generally expressed as some measure of the unwanted scattering

3.5
transparency measurement value

reciprocal of the slope of the regression line between ink film thickness and colour difference for overprints of

chromatic inks over black
4 Test method
4.1 Principle

Each ink is printed on the reference substrate described in Annex A at a range of ink film thicknesses. The

colours which result are measured colorimetrically.

Transparency is evaluated by printing each of the three primary colours on a black substrate at a range of film

thicknesses. The CIELAB colour difference is determined for each sample, between the printed and unprinted

black, and the linear regression coefficient (slope of the regression line) between ink film thickness and colour

difference is calculated for each colour.

For a detailed description of procedures, together with examples, see the informative Annex B.

4.2 Test print preparation
4.2.1 Prints for colorimetric evaluation

For each of the inks to be evaluated, a number of test prints shall be made using a printability tester, each

produced at a different ink film thickness in accordance with the conditions specified in ISO 2834-1. They shall

be made on the reference substrate as specified in Annex A. The sample material shall be kept in the dark

under standard conditions of 23 °C and 50 % RH. The range of ink film thicknesses produced shall

encompass that specified in 5.3. In cases where the approximate ink film thickness is known to result in the

closest match of the target
...

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