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ASTM E313-15e1

(Practice)

Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates

Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates

SIGNIFICANCE AND USE
5.1 This practice should be used only to compare specimens of the same material and same general appearance. For example, a series of specimens to be compared should have generally similar gloss, texture, and (if not opaque) thickness, and translucency.  
5.2 For yellowness measurement, this practice is limited to specimens having dominant wavelength in the range 570 to 580 nm, or Munsell hue approximately 2.5GY to 2.5Y. For whiteness measurement, this practice is limited to specimens having Munsell value greater than 8.3 (CIE Y greater than 65) and Munsell chroma no greater than 0.5 for B hues, 0.8 for Y hues, and 0.3 for all other hues (see 3.3.1).  
5.3 The combination of measurement and calculation leading to indices of yellowness or whiteness is a psychophysical process, that is, the procedures specified are designed to provide numbers correlating with visual estimates made under specified typical observing conditions. Because visual observing conditions can vary widely, users should compare calculated indices with visual estimates to ensure applicability. Some standards addressing the visual estimation of color and color difference are Practices D1535, D1729, E1360, and E1541, and Guide E1499.  
5.4 This practice does not cover the preparation of specimens, a procedure that may affect significantly the quantities measured. In general, specimens should be prepared and presented for measurement in the manner that is standard for the test being performed. Select enough specimens or specimen areas to provide an average result that is representative of each sample to be tested. See Practice E1345.
SCOPE
1.1 This practice provides numbers that correlate with visual ratings of yellowness or whiteness of white and near-white or colorless object-color specimens, viewed in daylight by an observer with normal color vision. White textiles, paints, and plastics are a few of the materials that can be described by the indices of yellowness or whiteness calculated by this practice.  
1.2 For a complete analysis of object colors, by a specified observer and under a specified illuminant, use of three parameters is required. For near-white specimens, however, it is often useful to calculate single-number scales of yellowness or whiteness. This practice provides recommended equations for such scales and discusses their derivations and uses, and limits to their applicability (see also Ref (1)2).  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Dec-2014
ICS
17.180.20 - Colours and measurement of light
Technical Committee
E12 - Color and Appearance
Drafting Committee
E12.04 - Color and Appearance Analysis
Current Stage
Ref Project

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ASTM E313-15e1 - Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color CoordinatesASTM E313-15e1 - Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates
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REDLINE ASTM E313-15e1 - Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color CoordinatesREDLINE ASTM E313-15e1 - Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
´1
Designation: E313 − 15
Standard Practice for
Calculating Yellowness and Whiteness Indices from
1
Instrumentally Measured Color Coordinates
This standard is issued under the fixed designation E313; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Section 7 was corrected editorially in June 2015.
1. Scope Differences of Diffusely-Illuminated Opaque Materials
,4
D1925Test Method for Yellowness Index of Plastics
1.1 This practice provides numbers that correlate with
E284Terminology of Appearance
visual ratings of yellowness or whiteness of white and near-
E308PracticeforComputingtheColorsofObjectsbyUsing
white or colorless object-color specimens, viewed in daylight
the CIE System
byanobserverwithnormalcolorvision.Whitetextiles,paints,
E805Practice for Identification of Instrumental Methods of
and plastics are a few of the materials that can be described by
Color or Color-Difference Measurement of Materials
the indices of yellowness or whiteness calculated by this
E991Practice for Color Measurement of Fluorescent Speci-
practice.
mens Using the One-Monochromator Method
1.2 For a complete analysis of object colors, by a specified
E1164PracticeforObtainingSpectrometricDataforObject-
observer and under a specified illuminant, use of three param-
Color Evaluation
etersisrequired.Fornear-whitespecimens,however,itisoften
E1247Practice for Detecting Fluorescence in Object-Color
useful to calculate single-number scales of yellowness or
Specimens by Spectrophotometry
whiteness. This practice provides recommended equations for
E1331Test Method for Reflectance Factor and Color by
such scales and discusses their derivations and uses, and limits
Spectrophotometry Using Hemispherical Geometry
2
to their applicability (see also Ref (1) ).
E1345Practice for Reducing the Effect of Variability of
1.3 The values stated in SI units are to be regarded as Color Measurement by Use of Multiple Measurements
E1347Test Method for Color and Color-Difference Mea-
standard. No other units of measurement are included in this
standard. surement by Tristimulus Colorimetry
E1348Test Method for Transmittance and Color by Spec-
1.4 This standard does not purport to address all of the
trophotometry Using Hemispherical Geometry
safety concerns, if any, associated with its use. It is the
E1349Test Method for Reflectance Factor and Color by
responsibility of the user of this standard to establish appro-
Spectrophotometry Using Bidirectional (45°:0° or 0°:45°)
priate safety and health practices and determine the applica-
Geometry
bility of regulatory limitations prior to use.
E1360Practice for Specifying Color by Using the Optical
Society of America Uniform Color Scales System
2. Referenced Documents
E1499Guide for Selection, Evaluation, and Training of
3
2.1 ASTM Standards:
Observers
D1535Practice for Specifying Color by the Munsell System
E1541Practice for Specifying and Matching Color Using
D1729Practice for Visual Appraisal of Colors and Color 5
the Colorcurve System (Withdrawn 2007)
3. Terminology
1
This practice is under the jurisdiction ofASTM Committee E12 on Color and
Appearance and is the direct responsibility of Subcommittee E12.04 on Color and 3.1 Terms and definitions in Terminology E284 are appli-
Appearance Analysis.
cable to this practice.
Current edition approved Jan. 1, 2015. Published February 2015. Originally
approved in 1967. Last previous edition approved in 2010 as E313–10. DOI: 3.2 Definitions:
10.1520/E0313-15E01.
2
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
this practice.
3 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.astm.org. Replaced by Section 6 of E313.
5
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
´1
E313 − 15
3.2.1 perfect reflecting diffuser, n—ideal reflecting surface 580 nm, or Munsell hue approximately 2.5GY to 2.5Y. For
that neither absorbs nor transmits light, but reflects diffusely, whiteness measurement, this practice is limited to specimens
withtheradianceofthereflectingsurfacebeingthesameforall having Munsell value greater than 8.3 (CIE Y greater than 65)
reflecting angles, regardless of the angul
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: E313 − 15 E313 − 15
Standard Practice for
Calculating Yellowness and Whiteness Indices from
1
Instrumentally Measured Color Coordinates
This standard is issued under the fixed designation E313; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Section 7 was corrected editorially in June 2015.
1. Scope
1.1 This practice provides numbers that correlate with visual ratings of yellowness or whiteness of white and near-white or
colorless object-color specimens, viewed in daylight by an observer with normal color vision. White textiles, paints, and plastics
are a few of the materials that can be described by the indices of yellowness or whiteness calculated by this practice.
1.2 For a complete analysis of object colors, by a specified observer and under a specified illuminant, use of three parameters
is required. For near-white specimens, however, it is often useful to calculate single-number scales of yellowness or whiteness. This
practice provides recommended equations for such scales and discusses their derivations and uses, and limits to their applicability
2
(see also Ref (1) ).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
3
2.1 ASTM Standards:
D1535 Practice for Specifying Color by the Munsell System
D1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque Materials
,4
D1925 Test Method for Yellowness Index of Plastics
E284 Terminology of Appearance
E308 Practice for Computing the Colors of Objects by Using the CIE System
E805 Practice for Identification of Instrumental Methods of Color or Color-Difference Measurement of Materials
E991 Practice for Color Measurement of Fluorescent Specimens Using the One-Monochromator Method
E1164 Practice for Obtaining Spectrometric Data for Object-Color Evaluation
E1247 Practice for Detecting Fluorescence in Object-Color Specimens by Spectrophotometry
E1331 Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry
E1345 Practice for Reducing the Effect of Variability of Color Measurement by Use of Multiple Measurements
E1347 Test Method for Color and Color-Difference Measurement by Tristimulus Colorimetry
E1348 Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry
E1349 Test Method for Reflectance Factor and Color by Spectrophotometry Using Bidirectional (45°:0° or 0°:45°) Geometry
E1360 Practice for Specifying Color by Using the Optical Society of America Uniform Color Scales System
E1499 Guide for Selection, Evaluation, and Training of Observers
5
E1541 Practice for Specifying and Matching Color Using the Colorcurve System (Withdrawn 2007)
1
This practice is under the jurisdiction of ASTM Committee E12 on Color and Appearance and is the direct responsibility of Subcommittee E12.04 on Color and
Appearance Analysis.
Current edition approved Jan. 1, 2015. Published February 2015. Originally approved in 1967. Last previous edition approved in 2010 as E313 – 10. DOI:
10.1520/E0313-15.10.1520/E0313-15E01.
2
The boldface numbers in parentheses refer to the list of references at the end of this practice.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
The last approved version of this historical standard is referenced on www.astm.org. Replaced by Section 6 of E313.
5
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
´1
E313 − 15
3. Terminology
3.1 Terms and definitions in Terminology E284 are applicable to this practice.
3.2 Definitions:
3.2.1 perfect reflecting diffuser, n—ideal
...

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5.1 The most fundamental method for obtaining CIE tristimulus values or other color coordinates for describing the colors of visual display units (VDUs) is by the use of spectroradiometric data. (See CIE No. 18 and 63.) These data are used by summation together with numerical values representing the 1931 CIE Standard Observer and normalized to Km, the maximum spectral luminous efficacy function.  
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4.4 The confirmation of the presence of fluorescence is made by the comparison of spectral curves, color difference, or single parameter difference such as ΔY between the measurements.
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1.1 This practice provides spectrophotometric methods for detecting the presence of fluorescence in object-color specimens.
Note 1: Since the addition of fluorescing agents (colorants, whitening agents, etc.) is often intentional by the manufacturer of a material, information on the presence or absence of fluorescent properties in a specimen may often be obtained from the maker of the material.  
1.2 This practice requires the use of a spectrophotometer that both irradiates the specimen over the wavelength range from 340 nm to 700 nm and allows the spectral distribution of illumination on the specimen to be altered as desired.  
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SCOPE
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1.2 For product specification, the purchaser and the seller shall agree upon the permissible color tolerance between test specimen and reference and the procedure for calculating the color tolerance. Each material and condition of use may require specific color tolerances because other appearance factors, (for example, specimen proximity, gloss, and texture), may affect the correlation between the magnitude of a measured color difference and its commercial acceptability.  
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5.1 Acoustical materials are often used as the entire ceiling of rooms and are therefore an important component of the lighting system. The luminous reflectance of all important components must be known in order to predict the level of illumination that will be obtained.  
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ASTM E1349-06(2022)(Test Method)
Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Bidirectional (45°:0° or 0°:45°) Geometry

SIGNIFICANCE AND USE
5.1 The most direct and accessible methods for obtaining the color coordinates of object colors are by instrumental measurement using spectrophotometers or spectrocolorimeters with either hemispherical or bidirectional optical measuring systems. This test method provides procedures for such measurement by spectrophotometry using a bidirectional (0:45 or 45:0) optical measuring system. The method for color and color difference measurement using filter colorimeters is contained in Test Method E1347.  
5.2 This test method is especially suitable for measurement of the following types of specimens for the indicated uses (see also Guide E179 and Practice E805):  
5.2.1 Object-color specimens of any gloss level for color assessment.  
5.2.2 Object-color specimens with physically flat, smooth surfaces from which to obtain data for use in computer colorant formulation.  
5.2.3 Retroreflective specimens.
Note 1: To ensure inter-instrument agreement in the measurement of specimens with intermediate gloss, for formulation, or of retroreflective specimens, significantly tighter tolerances than those given in Practice E1164, Influx and Efflux Conditions, 45°:Normal (45:0) and Normal:45° (0:45) Reflectance Factor section, may be required for the instrument angles of illumination and viewing. Information on the required tolerances is being developed.  
5.3 This test method is not recommended for measurement of specimens with bare metal surfaces for color assessment, for which the use of hemispherical measurement geometry, as with an integrating-sphere type instrument, is preferable (see Guide E179).
SCOPE
1.1 This test method covers the instrumental measurement of the reflection properties and color of object-color specimens by use of a spectrophotometer or spectrocolorimeter with a bidirectional optical measuring system, such as annular, circumferential, or uniplanar 45:0 or 0:45 geometry.  
1.2 This test method is generally suitable for any non-fluorescent, flat object-color specimen. It is especially recommended for measuring retroreflective specimens and specimens of intermediate gloss.  
1.3 Procedures required for the measurement of fluorescent object color are given in Practice E991 and Practice E2153.  
1.4 Procedures required for the measurement of color using filter colorimeters are contained in Test Method E1347 and this standard does not address those instruments.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM E2301-12(2022)(Test Method)
Standard Test Method for Daytime Colorimetric Properties of Fluorescent Retroreflective Sheeting and Marking Materials for High Visibility Traffic Control and Personal Safety Applications Using 45°:Normal Geometry

SIGNIFICANCE AND USE
5.1 This test method provides procedures for obtaining tristimulus values, luminance factors and chromaticity coordinates of fluorescent-retroreflective materials by bispectral colorimetry using a 45:0 or 0:45 optical measuring system.  
5.2 The CIE 1931 (2°) standard observer is used to calculate the colorimetric properties of fluorescent-retroreflective sheeting and markings used in daytime high visibility traffic control and personal safety applications because in practice these materials are primarily viewed from a distance where they subtend less than 4° of the visual field.  
5.3 This test method is applicable to object-color specimens of any gloss level.  
5.4 Due to the retroreflective properties of these materials the colorimetric data may not be suitable for use in computer colorant formulation.  
5.5 This test method is suitable for quality control testing of fluorescent-retroreflective sheeting and marking materials.
Note 1: Separation of the fluorescence and reflectance components from the total colorimetric properties provides useful and meaningful information to evaluate independently the luminescent and diffuse reflective efficiency and consistency of these materials.  
5.6 This test method is the referee method for determining the conformance of fluorescent-retroreflective sheeting and marking materials to standard daytime colorimetric specifications.
SCOPE
1.1 This test method describes the instrumental measurement of the colorimetric properties (CIE tristimulus values, luminance factors, and chromaticity coordinates) of fluorescent-retroreflective sheeting and marking materials when illuminated by daylight.  
1.2 This test method is generally applicable to any sheeting or marking material having combined fluorescent and retroreflective properties used for daytime high visibility traffic control and personal safety applications.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM E179-17(2022)(Guide)
Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials

SCOPE
1.1 This guide is intended for use in selecting terminology, measurement scales, and instrumentation for describing or evaluating such appearance characteristics as glossiness, opacity, lightness, transparency, and haziness in terms of reflected or transmitted light. This guide does not consider the spectral variations responsible for color, but the geometric variables described herein can importantly affect instrumentally measured values of color. This guide is general in scope rather than specific as to instrument or material.  
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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