ASTM D4303-06

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
Designation:D4303–06
Standard Test Methods for
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Lightfastness of Colorants Used in Artists’ Materials
This standard is issued under the fixed designation D4303; 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. Scope 1.7 This standard does not purport to address the safety
concerns, if any, associated with its use. It is the responsibility
1.1 Four test methods to accelerate the effects of long term
of the user of this standard to establish appropriate safety and
indoor illumination on artists’ materials are described below.
health practices and determine the applicability of regulatory
One of the natural daylight methods and one of the xenon-arc
limitations prior to use.
methods are used to categorize the lightfastness of colorants.
1.1.1 Test Method A—Exposure in southern Florida to
2. Referenced Documents
natural daylight filtered through window glass.
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2.1 ASTM Standards:
1.1.2 Test Method B—Exposure in Arizona to natural day-
D2244 Practice for Calculation of Color Tolerances and
light filtered through window glass.
Color Differences from Instrumentally Measured Color
1.1.3 Test Method C—Exposure in a non-humidity con-
Coordinates
trolled xenon-arc device simulating daylight filtered through
D4302 Specification for Artists’ Oil, Resin-Oil, and Alkyd
window glass.
Paints
1.1.4 Test Method D—Exposure in a humidity controlled
D4674 Practice for Accelerated Testing for Color Stability
xenon-arc device simulating daylight filtered through window
of Plastics Exposed to Indoor Office Environments
glass.
D5067 Specification for Artists’ Watercolor Paints
1.2 These test methods are used to approximate the color
D5098 Specification for Artists’ Acrylic Dispersion Paints
change that can be expected over time in colorants used in
D5724 Specification for Gouache Paints
artists’ materials exposed indoors to daylight through window
D6901 Specification for Artists’ Colored Pencils
glass.
E284 Terminology of Appearance
NOTE 1—The color changes that result from accelerated exposure may
E1347 Test Method for Color and Color-Difference Mea-
not duplicate the results of normal indoor exposure in a home, art gallery,
surement by Tristimulus Colorimetry
or museum.The relative resistance to change, however, can be established
E1348 Test Method for Transmittance and Color by Spec-
so colored materials can be assigned to categories of relative lightfastness.
trophotometry Using Hemispherical Geometry
NOTE 2—Users who wish to test colored materials under fluorescent
E1349 Test Method for Reflectance Factor and Color by
illumination should consult Practice D4674.
Spectrophotometry Using Bidirectional (45°:0° or 0°:45°)
1.3 Lightfastness categories are established to which colo-
Geometry
rants are assigned based on the color difference between
G24 PracticeforConductingExposurestoDaylightFiltered
specimens before and after exposure.
Through Glass
1.4 Color difference units are calculated by the CIE 1976
G113 TerminologyRelatingtoNaturalandArtificialWeath-
L*a*b* color difference equation.
ering Tests of Nonmetallic Materials
1.5 These test methods apply to colored artists’ materials.
G141 Guide forAddressing Variability in Exposure Testing
1.6 The values stated in SI units are to be regarded as the
of Nonmetallic Materials
standard. The values given in parentheses are for information
G151 Practice for Exposing Nonmetallic Materials in Ac-
only.
celerated Test Devices that Use Laboratory Light Sources
G155 PracticeforOperatingXenonArcLightApparatusfor
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These test methods are under the jurisdiction of ASTM Committee D01 on
Paint and Related Coatings, Materials, and Applications and are the direct
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responsibility of Subcommittee D01.57 on Artist Paints and Related Materials. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved July 1, 2006. Published July 2006. Originally approved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 1983. Last previous edition approved in 2003 as D4303 – 03. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
D4303-06. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4303–06
Exposure of Non-Metallic Materials 7. Procedure
7.1 Prepare seven specimens of the art materials to be
3. Terminology
tested, following the directions given in the appropriate speci-
3.1 Definitions—Appearance terms used in these test meth-
fication. If there is no specification
...