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About Color Fastness

Textile dyeing

1.Dyeing Depth

Generally, the darker the color is, the lower the fastness to washing and rubbing is.

Generally, the lighter the color is, the lower the fastness to sunlight and chlorine bleaching.

2. Is color fastness to chlorine bleaching of all vat dyes good?

For cellulose fibers  that require resistance to chlorine bleaching, vat dyes are generally used when reactive dyes are not available. But not all vat dyes (indanthrene dyes) are resistant to chlorine bleaching, such as vat blue BC and RSN, etc.

3.Color Fastness on Dye Color Swatch

When you check the fastness index of a dye, it is usually through the dye color swatch provided by the dye company. However please note that the fastness index on the color swatch provided by the dye company refers to the fastness level at standard dyeing depth, not at any dyeing depth.

4.Color Matching

If a color is dyed with two or three dyes, its final fastness index is affected by the dye with the worst fastness of them.

5.Sun Light Rating

Light fastness of AATCC is five grades system and the highest is Grade 5.

Light fastness of ISO is eight grades system and the highest is Grade 8.

So when choosing dyes, please check clearly the standard request.

6.Fastness to Chlorine Water (Swimming Pool)

The fastness to chlorine water (swimming pool) of textiles generally has three valid chlorine standards for concentrations, as 20ppm, 50ppm and 100ppm.

Generally, 20ppm is for towels and bathrobes, etc. And 50ppm and 100ppm is suitable for swimwear.

Dyeing fabric

7.Color Fastness to Non-Chlorine Bleach

Color fastness to non-chlorine bleach is a test for oxidation bleaching  fastness that is distinguished from chlorine bleaching (sodium hypochlorite).

Generally two different oxidants are used to make test, as sodium perborate and hydrogen peroxide.

8. Saliva Fastness

Infant textiles generally require saliva fastness. Because as we all know, babies will drool and chew their fingers.

 9.Fastness to Migration of Fluorescent Whitening Agent

Some European countries have restrictions on fluorescent whitening agent in textiles. But for textiles need to be treated by fluorescent whitening agent, if the fastness to migration is up to standard, it is acceptable to use fluorescent whitening agent.

10.Complex Color Fastness to Light-Perspiration

Complex color fastness to light-perspiration is the only composite test method in color fastness series, which is to test the test the fading degree of dyed fiber products under combined action of both perspiration and sunlight.

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Post time: Jul-04-2022