ASTM D4303 - 10

    Standard Test Methods for Lightfastness of Colorants Used in Artists' Materials

    Active Standard ASTM D4303 | Developed by Subcommittee: D01.57

    Book of Standards Volume: 06.02


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    Significance and Use

    The retention of chromatic properties by a colorant over a long period of years is essential in a work of art. Accelerated exposure simulates color changes that may reasonably be expected. The producer and the user of artists' materials, therefore, can be apprised of suitable colorants.

    Variations in results may be expected between the test methods. Also, some variation may be expected when the same test is repeated. Variations in Methods A and B are due to differences in outdoor conditions that are not accounted for in testing to equivalent radiant exposures. Information on sources of variability and strategies for addressing variability in laboratory accelerated exposure tests is found in Guide G141.

    This standard does not cover factors other than lightfastness that can affect the permanence of art materials.

    1. Scope

    1.1 Four test methods to accelerate the effects of long term indoor illumination on artists' materials are described below. One of the natural daylight methods and one of the xenon-arc methods are used to categorize the lightfastness of colorants.

    1.1.1 Test Method AExposure in southern Florida to natural daylight filtered through window glass.

    1.1.2 Test Method BExposure in Arizona to natural daylight filtered through window glass.

    1.1.3 Test Method CExposure in a non-humidity controlled xenon-arc device simulating daylight filtered through window glass.

    1.1.4 Test Method DExposure in a humidity controlled xenon-arc device simulating daylight filtered through window glass.

    1.2 These test methods are used to approximate the color change that can be expected over time in colorants used in artists' materials exposed indoors to daylight through window glass.

    Note 1—The color changes that result from accelerated exposure may not duplicate the results of normal indoor exposure in a home, art gallery, or museum. The relative resistance to change, however, can be established so colored materials can be assigned to categories of relative lightfastness.

    Note 2—Users who wish to test colored materials under fluorescent illumination should consult Practice D4674.

    1.3 Lightfastness categories are established to which colorants are assigned based on the color difference between specimens before and after exposure.

    1.4 Color difference units are calculated by the CIE 1976 L*a*b* color difference equation.

    1.5 These test methods apply to colored artists' materials.

    1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    1.7 This standard does not purport to address 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

    D4302 Specification for Artists Oil, Resin-Oil, and Alkyd Paints

    D4674 Practice for Accelerated Testing for Color Stability of Plastics Exposed to Indoor Office Environments

    D5067 Specification for Artists Watercolor Paints

    D5098 Specification for Artists Acrylic Dispersion Paints

    D5724 Specification for Gouache Paints

    D6901 Specification for Artists Colored Pencils

    E284 Terminology of Appearance

    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

    G24 Practice for Conducting Exposures to Daylight Filtered Through Glass

    G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials

    G141 Guide for Addressing Variability in Exposure Testing of Nonmetallic Materials

    G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources

    G155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials


    ICS Code

    ICS Number Code 87.060.10 (Pigments and extenders)

    UNSPSC Code

    UNSPSC Code 12170000(Colorants)


    DOI: 10.1520/D4303-10

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