In white or light color products such as woolens, silk, man-made fibers, leather, etc., bleached textiles have yellowing phenomenon in varying degrees. Some occur in the process of processing, and some occur in the process of use.

The Colorfastness Tester principle, cover the rectangular textile end to end with a anti-dazzling screen, and then placed in a special test box, under a certain temperature and humidity, with a solar lamp or ultraviolet lamp to do irradiation under a certain of time, and observed the color change on illumination parts on sample.

According to GB 250 grey card to evaluate the color changing degree of the sample, so as to determine the ability of resistance to yellowing of light textiles.

Textile light yellow color fastness is mainly refers to under certain environmental relative humidity, temperature, after uv or ultraviolet/visible light irradiation occurred the phenomenon of color, generally, is equal to textile light color fastness.

But in fact, two concepts have different nature: light fastness test is mainly test the color fading degree for the dyes on the textile after illumination.The Light yellowing was assessed by the addition of bleach and other chemicals to the textiles.

At present, the standard HG/ t3689-2001 "test method for resistance to yellow yellowing of footwear", which is used for the evaluation of yellow yellowing of white or light colored shoes, has certain limitations in the application of textiles.

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