ASTM E1349 - 06(2013)

    Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Bidirectional (45°:0° or 0°:45°) Geometry

    Active Standard ASTM E1349 | Developed by Subcommittee: E12.02

    Book of Standards Volume: 06.01


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    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 1To 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).

    1. 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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

    E179 Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials

    E284 Terminology of Appearance

    E308 Practice for Computing the Colors of Objects by Using the CIE System

    E694 Specification for Laboratory Glass Volumetric Apparatus

    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

    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

    E1767 Practice for Specifying the Geometries of Observation and Measurement to Characterize the Appearance of Materials

    E2153 Practice for Obtaining Bispectral Photometric Data for Evaluation of Fluorescent Color

    E2214 Practice for Specifying and Verifying the Performance of Color-Measuring Instruments


    ICS Code

    ICS Number Code 17.180.20 (Colours and measurement of light)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/E1349-06R13

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