Color Fastness Test to Light | Light Fastness Grades

The purpose of Color fastness to light test is to determine how much the color will fade when exposed to a known light source. It is an off line quality assurance system. Generally man wears the fabric and goes outside of the home for doing their job. In day; sun light fall on the fabric surface. So it needs to know how much protection ability have a fabric to sun light. It is determined by an experiment called color fastness to light. To measure the color fastness a blue scale is used. After completing the test, sample is compared with the blue scale.

Light fastness tester
Principle of Color Fastness to Light:
This test measures the resistance to fading of dyed textile when exposed to day light. The test sample is exposed to light for a certain time which is about 24 hours to 72 hours or by customer/buyer demand and compare the change with original unexposed sample the changes are assessed by Blue Scales.

Light Fastness Grades:
Grade
Degree of Fading
Light Fastness Type
8
No fading
Outstanding
7
Very slight fading
Excellent
6
Slight fading
Very good
5
Moderate fading
Good
4
Appreciable fading
Moderate
3
Significant fading
Fair
2
Extensive fading
Poor
1
Very extensive fading
Very poor

Color Fastness to Light with the Microsol light Fastness Tester:
The testing is done step by step. Following step is maintained during measure the color fatness to light.
  • Cut the four pieces of test specimens according to the length & width wise and attached with the specimen holder.
  • Then the holder set in to the Microsol light fastness tester.
  • Then the experiment continued at 72 hours according to the buyer’s requirement.
  • After 72 hours later the specimen taken from the light fastness tester
  • Then the test specimen compare with the Blue scale or computer color matching system (CCMS).
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Editor-in-Chief:

Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.


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