ASTM D4303-03

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

SCOPE
1.1 Four test methods to accelerate the effects of long term indoor illumination on artists' paints are described as follows:
1.1.1 Test Method A—Exposure to natural daylight filtered through glass,
1.1.2 Test Method B—Exposure to irradiance from daylight fluorescent lamps,
1.1.3 Test Method C—Exposure in xenon-arc irradiance simulating daylight filtered through glass, and
1.1.4 Test Method D—Exposure to irradiance from cool white fluorescent lamps and soda-lime glass filtered fluorescent UV sunlamps.
1.2 These test methods are used to approximate the color change that can be expected over time in pigments used in artists' paints in normal indoor exposure.
Note 1—The color changes that result from accelerated exposure may not duplicate the results of normal indoor exposure in a home or gallery. The relative resistance to change, however, can be established so pigments can be assigned to categories of relative lightfastness.
1.3 Lightfastness categories are established to which pigments 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 artists' oil, resin-oil, acrylic emulsion, alkyd, watercolor paints, and gouache paints.
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.

General Information

• Status: Historical
• Publication Date: 09-May-2003
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.57 - Artist Paints and Related Materials

Relations

• Replaces: ASTM D4303-99 - Standard Test Methods for Lightfastness of Pigments Used in Artists' Paints
• Effective Date: 10-May-2003
• Replaced By: ASTM D4303-06 - Standard Test Methods for Lightfastness of Colorants Used in Artists' Materials
• Effective Date: 01-Jul-2006
• Referred By: ASTM D5098-16(2021) - Standard Specification for Artists' Acrylic Dispersion Paints
• Effective Date: 10-May-2003
• Referred By: ASTM D5067-16(2021) - Standard Specification for Artists' Watercolor Paints
• Effective Date: 10-May-2003
• Referred By: ASTM D5383-16(2021) - Standard Practice for Visual Determination of the Lightfastness of Art Materials by Artists and Art Technologists
• Effective Date: 10-May-2003
• Referred By: ASTM G24-21 - Standard Practice for Conducting Exposures to Daylight Filtered Through Glass
• Effective Date: 10-May-2003
• Referred By: ASTM D8330-20 - Standard Specification for Artists’ Pastels
• Effective Date: 10-May-2003
• Referred By: ASTM D5724-16(2021) - Standard Specification for Gouache Paints
• Effective Date: 10-May-2003
• Referred By: ASTM D6901-15(2021) - Standard Specification for Artists' Colored Pencils
• Effective Date: 10-May-2003
• Referred By: ASTM D4302-14(2021) - Standard Specification for Artists’ Oil, Resin-Oil, and Alkyd Paints
• Effective Date: 10-May-2003

Standards Content (Sample)

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:D4303–03
Standard Test Methods for
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Lightfastness of Colorants Used in Artists’ Materials
This standard is issued under the fixed designation D 4303; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Color Differences from Instrumentally Measured Color
2
Coordinates
1.1 Four test methods to accelerate the effects of long term
D 4302 Specification forArtists’ Oil, Resin–Oil, andAlkyd
indoor illumination on artists’ paints are described as follows:
3
Paints
1.1.1 Test Method A—Exposure to natural daylight filtered
D 4674 Practice for Accelerated Testing for Color Stability
through glass,
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of Plastics Exposed to Indoor Office Environment
1.1.2 Test Method B—Exposure to irradiance from daylight
3
D 5067 Specification for Artists’ Watercolor Paints
fluorescent lamps,
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D 5098 Specification for Artists’ Acrylic Emulsion Paints
1.1.3 Test Method C—Exposure in xenon-arc irradiance
3
D 5724 Specification for Gouache Paints
simulating daylight filtered through glass, and
2
E 284 Terminology of Appearance
1.1.4 Test Method D—Exposure to irradiance from cool
E 1347 Test Method for Color and Color–Difference Mea-
whitefluorescentlampsandsoda-limeglassfilteredfluorescent
2
surement by Tristimulus (Filter) Colorimetry
UV sunlamps.
E 1348 Test Method for Transmittance and Color by Spec-
1.2 These test methods are used to approximate the color
2
trophotometry Using Hemispherical Geometry
change that can be expected over time in pigments used in
E 1349 Test Method for Reflectance Factor and Color by
artists’ paints in normal indoor exposure.
2
Spectrophotometry Using Bidirectional Geometry
NOTE 1—The color changes that result from accelerated exposure may
G 24 Practice for Conducting Exposures to Daylight Fil-
not duplicate the results of normal indoor exposure in a home or gallery.
5
tered Through Glass
Therelativeresistancetochange,however,canbeestablishedsopigments
G 113 Terminology Relating to Natural and Artificial
can be assigned to categories of relative lightfastness.
5
Weathering Tests of Nonmetallic Materials
1.3 Lightfastness categories are established to which pig-
G 151 Practice for Exposing Nonmetallic Materials in Ac-
ments are assigned based on the color difference between 5
celerated Test Devices that Use Laboratory Light Sources
specimens before and after exposure.
G 155 Practice for Operating Xenon Arc Light Apparatus
1.4 Color difference units are calculated by the CIE 1976
5
for Exposure of Non-metallic Materials
L*a*b* color difference equation.
1.5 These test methods apply to artists’ oil, resin-oil, acrylic
3. Terminology
emulsion, alkyd, watercolor paints, and gouache paints.
3.1 Definitions—Appearance terms used in these test meth-
1.6 The values stated in SI units are to be regarded as the
ods are defined in Definitions E 284. Terms relating to natural
standard. The values given in parentheses are for information
and artificial lightfastness tests are defined in Definitions
only.
G 113.
1.7 This standard does not purport to address the safety
3.1.1 glass—as used in these test methods, glass refers to
concerns, if any, associated with its use. It is the responsibility
single-strength window glass.
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
4. Summary of Test Methods
limitations prior to use.
4.1 Color measurements are made on specimens that have
been prepared as directed in Specification D 4302, D 5067,
2. Referenced Documents
D 5098 or D 5724 depending on the vehicle. The measure-
2.1 ASTM Standards:
ments are recorded for comparison with readings made after
D 2244 Practice for Calculation of Color Tolerances and
the specimens have been exposed.
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These test methods are under the jurisdiction of ASTM Committee D01 on
2
Paint and Related Coatings, Materials, and Applications and are the direct Annual Book of ASTM Standards, Vol 06.01.
3
responsibility of Subcommittee D01.57 on Artist Paints and Related Materials. Annual Book of ASTM Standards, Vol 06.02.
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Current edition approved May 10, 2003. Published June 2003. Originally Annual Book of ASTM Standards, Vol 08.03.
5
approved in 1983. Last previous edition approved in 1999 as D 4303 – 99. Annual Book of ASTM Standards, Vol 14.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4303–03
4.2 Specimens are exposed to daylight filtered through glass 7.2.1 Read specimen panels always with any brush marks in
or to laboratory test sou
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