A Comprehensive Guide to Color Fastness to Light


Color fastness to light is to measure the solar resistance of dyes and materials. The test method can be either sun exposure or solar machine exposure. The fading degree of the sample after sun exposure is compared with the standard color sample.

Under artificial conditions, accelerate the simulation of various textiles, clothing, dyes, plastics, rubber, plastics, automotive interior parts, geosynthetic and other materials often exposed to natural climate conditions due to the sun, rain, temperature, humidity, alternating light and shade after the comprehensive effect of its physical and chemical properties (also known as aging) test.

Factors affecting color fastness to light

Effect of dye concentration on color fastness to light：
The color fastness of cotton fabric is related to the variety of dye. The lower the dye concentration, the worse the color fastness.
The influence of pH value of fabric on color fastness to light:
pH value has a great influence on the sun fastness of cotton fabric. The color fastness of
cotton fabric near neutral is the best. The color fastness of cotton fabric is not good for acid or alkaline.
Effect of moisture content of fabric on color fastness to light:
The moisture content has great influence on the color fastness of cotton fabric. The higher the moisture content, the worse the color fastness. This is mainly because the larger the moisture content of cotton fabric, the larger the area of the dye particles gathered on the surface of the fabric and the water, the lower the color fastness to light.
The influence of light fastness accelerator on sun fastness:
Sun fastness accelerators are effective for improving the sun fastness of cotton fabrics and should be used together with other finishing procedures. Therefore, attention should be paid to the synergistic and reducing effects of sun fastness accelerators and other reagents when finishing cotton fabrics.
We also analyzed the influencing factors of color fastness to light from some other perspectives.
More information about color fastness to light can be found in https://fyitester.com/color-fastness-to-light/.

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