What is color fastness?

Color fastness (Color fastness) is also known as dyeing fastness, dyeing fastness. It refers to the resistance of the color of the textile to various effects in the process and use.

It refers to the degree of fading of dyed fabrics under the action of external factors (extrusion, friction, washing, rain, exposure, light, seawater impregnation, saliva impregnation, water stains, sweat stains, etc.) in the process of use or processing.

It assesses the fastness level according to the discoloration of the specimen and the staining of the undyed lining fabric.

Textile color fastness test is a regular test item in the textile inherent quality test. It is an important indicator of fabric assessment.

Why test color fastness?

Good color fastness and poor, directly affect the beauty of wearing and human health and safety, poor color fastness of the product in the wearing process, encounter rain, sweat will cause the pigment on the fabric off fade, the molecules of the dye and heavy metal ions may be absorbed by the human body through the skin and endanger the health of human skin, on the other hand, will also affect the other clothing worn on the body is stained.

Types of color fastness test

The color fastness of the fabric is related to the type of fiber, yarn structure, fabric organization, printing and dyeing method, dye type and the size of the external force.

The color fastness test generally includes soap fastness, rubbing fastness, perspiration fastness, water fastness, light fastness (sunlight) fastness, seawater fastness, saliva fastness, chlorine fastness, dry cleaning fastness, heat pressure fastness, etc. Sometimes there are some special requirements of color fastness according to different textiles or different use environment sunlight fastness tester.

Usually when the color fastness test, is the degree of discoloration of the dyed material and the degree of staining of the lining, the color fastness rating, in addition to light fastness for eight, the rest are five. The higher the grade, the better the color fastness is indicated.

Explanatory notes.

Soap resistance color fastness, is to simulate the color change of textiles after washing liquid washing process and the staining of other fabrics, the specimen through the collision with the container and stainless steel beads to simulate washing.

Fastness to rubbing, is a simulation of colored textiles due to rubbing and color transfer to another fabric surface degree. It can be divided into dry state rubbing and wet state rubbing.

Color fastness to perspiration, is to simulate the degree of firmness of textiles to artificial perspiration.

Water color fastness, is to simulate the degree of textile color change after immersed in water.

Light (sunlight) color fastness, is to simulate the degree of textile discoloration by the action of human sunlight.

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