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ASTM D4303-99

Historical Revision

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

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1.1 Three test methods consisting of exposure to light (natural sunlight or simulated sunlight) filtered through glass are described as follows:

1.1.1 Test Method A -Exposure under glass to the sun,

1.1.2 Test Method B -Exposure to irradiance from artificial daylight fluorescent lamps, and

1.1.3 Test Method C -Exposure in xenon-arc lightfastness apparatus.

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, and watercolor paints.

1.6 This standard does not purport to address the safety problems, 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.


SDO ASTM: ASTM International
Document Number D4303
Publication Date May 10, 1999
Language en - English
Page Count 10
Revision Level 99
Supercedes
Committee D01.57
Publish Date Document Id Type View
June 1, 2010 D4303-10 Revision
July 1, 2006 D4303-06 Revision
May 10, 2003 D4303-03 Revision
May 10, 1999 D4303-99 Revision
Dec. 1, 2022 D4303-10R22 Reaffirmation
July 1, 2016 D4303-10R16 Reaffirmation