Active Standard ASTM D4303 | Developed by Subcommittee: D01.57
Book of Standards Volume: 06.02
Historical (view previous versions of standard)
Significance and Use
The retention of chromatic properties by a color
Active Standard ASTM D4303 | Developed by Subcommittee: D01.57
Book of Standards Volume: 06.02
Historical (view previous versions of standard)
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.
1.1 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 A—Exposure in southern Florida to natural daylight filtered through window glass.
1.1.2 Test Method B—Exposure in Arizona to natural daylight filtered through window glass.
1.1.3 Test Method C—Exposure in a non-humidity controlled xenon-arc device simulating daylight filtered through window glass.
1.1.4 Test Method D—Exposure 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 coloran