Lightfastness Test Results

American Association of Textile Chemists and Colorists – Test Method 16-2004 – Colorfastness to Light – Developed in 1964 by AATCC Committee RA50

1. Purpose and Scope

1.1 This test method provides the general principles and procedures which are currently in use for determining the colorfastness to light of textile materials. The test options described are applicable to textile materials of all kinds and for colorants, finishes and treatments applied to textile materials.

Test Options included are:

  1. Enclosed Carbon-Arc Lamp, Continuous Light
  2. Enclosed Carbon-Arc Lamp, Alternate Light and Dark
  3. Xenon-Arc Lamp, Continuous Light, Black Panel Option
  4. Xenon-Arc Lamp, Alternate Light and Dark
  5. Xenon-Arc Lamp, Continuous Light, Black Standard Option
  6. Daylight Behind Glass

1.2 The use of these test options does not imply, expressly or otherwise, an accelerated test for a specific application. The relationship between any lightfastness test and the actual exposure in use must be determined and agreed upon by the contractual parties.

2. Principle

2.1 Samples of the textile material to be tested and the agreed upon comparison standard(s) are exposed simultaneously to a light source under specified conditions. The colorfastness to light of the specimen is evaluated by comparison of the color change of the exposed portion to the masked control portion of the test specimen or unexposed original material, using the AATCC Gray Scale for Color Change or by instrumental color measurement. Lightfastness classification is accomplished by evaluation versus a simultaneously exposed series of AATCC Blue Wool Lightfastness Standards.

3. Lightfast Test Results FOR grEENER sHADES dYE

Depth of ShadeColorResult
LightFlame Red4
MediumFlame Red4-5
HeavyFlame Red5
LightRuby Red6
MediumRuby Red6-7
HeavyRuby Red7
LightSunset Orange4
MediumSunset Orange4-5
HeavySunset Orange5
LightSunrise Yellow5-6
MediumSunrise Yellow5-6
HeavySunrise Yellow6
LightAmazon Green5-6
MediumAmazon Green6
HeavyAmazon Green6-7
LightCoral Reef Aqua3
MediumCoral Reef Aqua3-4
HeavyCoral Reef Aqua4
LightRiver Blue5-6
MediumRiver Blue6
HeavyRiver Blue6
LightAmethyst Purple5-6
MediumAmethyst Purple6
HeavyAmethyst Purple6
LightMidnight BlackTBD
MediumMidnight BlackTBD
HeavyMidnight BlackTBD
(Scale is 1-7, 7 is highest)