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What is color fastness What does color fastness mean?

Update:15 Jun 2018
Summary:

What is color fastness? What does color fastness mean? […]

What is color fastness? What does color fastness mean? What is the relationship between color fastness and what? The color fastness of fabrics (abbreviated as color fastness) means that the dyed or printed fabrics undergo external factors (extrusion, friction, water washing, rain, exposure, light, seawater dipping, saliva dipping, etc.) during use or processing. The degree of discoloration caused by water stains, perspiration, etc.) is an important indicator of fabrics. The color fastness is good, and the fabric is not easy to fade during post-processing or use; when the color fastness is poor, discoloration, slight coloring, or staining may occur, resulting in a lot of trouble.

The fabric color fastness usually includes:
Soap resistant, rub-resistant, light-resistant, bleach-resistant or resistant to oxidants <reducing agent>, resistance to ironing, sweating resistance, and sweat-fastness. Among them, soaping resistance, friction resistance, light resistance, water resistance, and perspiration resistance are some of the indicators of color fastness that most buyers in actual production and trade are paying close attention to.

1. Frequently Asked Questions about Color Fastness of Fabrics
In daily sampling and consumer complaints, the most common fabric color fastness issues are the following:
1) The fastness to sunlight is not acceptable. During the wearing process of coat garments, the parts with more sunlight are lightened or discolored (usually the back and shoulder parts), while the areas where there is less or less irradiation are the same or light in color, resulting in a uniform color of the original product. The shades of color are different and can no longer be used.

2) Color fastness to washing, color fastness to soaping and color fastness to dry cleaning are not acceptable. High-grade silk clothing, wool garments, and pure cotton garments are the most vulnerable to this problem.

3) The color fastness to rubbing is not qualified. During the use of the fabric, the degree of discoloration is different because different parts of the product are subjected to different degrees of friction. For example, the coat, elbow sleeves, collar and armpits are the most likely to fade. In addition, the hips and knees of pants are also easy to fade.

4) Perspiration fastness is not acceptable. It is mainly summer clothing or close-fitting underwear that fades when sweat is soaked.

2. Factors that affect color fastness and methods of improvement

Products with poor color fastness fade during wearing may affect other garments worn on the wearer, or contaminate other garments when washing with other garments, affecting appearance and performance; on the other hand, good and bad color fastness is also directly related to The health and safety of the human body. Dye molecules and heavy metal ions on products with poor color fastness may be absorbed by the human body to damage the skin and even cause harm to health.
Factors affecting the color fastness of fabrics are internal factors and external factors. Internal factors refer to the degree of firmness of dyes and fibers, and external factors refer to the external forces or environmental conditions provided by external factors during the use of the product. External factors cannot be controlled, so producers must strive to improve the color fastness of the product itself.