The color fastness to light of clothing is also called the color fastness to sunlight, which is to assess the degree of change in color of clothing under sunlight. Consumers sometimes find that after wearing some clothes a few times, the color on the reverse side is darker than the color on the front side. This is because the color fastness to light of this garment is too poor, and the front side fades after sun exposure.

With China's accession to the WTO and the continuous development of China's textile industry, more and more high-end apparel exports, foreign merchants' requirements on the appearance and internal quality of apparel are getting higher and higher, and color fastness is an item that must be evaluated for almost all types of apparel.

Recently, in addition to the conventional color fastness to washing, color fastness to rubbing, and color fastness to perspiration, the number of export contracts that regulate light fastness to clothing has gradually increased. The quality of clothing includes two parts: appearance quality and internal quality. Color fastness is one of the internal qualities. The color fastness well known by consumers includes washing fastness (the degree of discoloration of clothing in soapy water) and rubbing fastness ( The degree of discoloration of the clothing after rubbing with a dry or wet white cloth), the color fastness to perspiration (the degree of discoloration of the clothing worn close to the body after contact with sweat).

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