What are the classifications of colorfastness?

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Dyeing fastness refers to the ability of dyes or pigments to maintain the original color and luster under the influence of various external factors during the use or processing of dyed products. It is also the quality requirement for dyed and printed fabrics.

Because dyed fabrics will be colored or discolored due to light, sweat, friction, washing, ironing, etc. during wearing and storage, which will affect the appearance of the fabric or clothing. The nature or degree of the variation of the dyeing state can be expressed by the colorfastness. The dye fastness of the fabric is related to the fiber type, yarn structure, fabric structure, printing and dyeing method, dye type and external force. It can be divided into light fastness, washing or soaping fastness, rubbing fastness, perspiration fastness, ironing fastness and sublimation fastness, etc.

The dye fastness of normal fabrics is generally required to reach levels 3~4 to meet the requirements of wearing. Others include weather fastness, colorfastness to weeping, fastness to saliva, fastness to blister, fastness to dry cleaning, etc. These fastnesses put forward higher and higher requirements for the printing and dyeing of textiles.

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