Fastness tests are carried out to reveal the color change and staining properties of the fabrics and to determine the color strength. These tests are mainly done by sweating in natural environment, washing the products, staying in sunlight, rubbing on the ground and creating similar situations in the laboratory. For example, in order to determine the color fastness of the fabrics after certain washing conditions, wash fastness, to determine the color fastness of the fabrics after the wet waiting period, to determine the color fastness of the fabrics when wet with sea water, to determine the color fastness of the fabrics, When the sweat is exposed to basic sweat solutions to determine the color strength of the sweat fastness measurements are made.

Sweaty light fastness measurements are made in order to determine the color resistance of textile products if they are exposed to artificial light source which represents natural daylight by sweating.

The laboratories conducting fastness tests in accordance with the criteria and standards issued by national and international organizations are also accredited from national or international accreditation institutions in accordance with the principles of TS EN ISO / IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories.

Sweaty light fastness to determine the color changes of textile products after exposure to artificial light source representing natural daylight through perspiration is determined in accordance with the following standard:

• TS EN ISO 105-B07 Textiles - Color fastness tests - Part B07: Determination of color fastness to textiles wetted by artificial sweat against light

The tests are also based on the following standards developed by foreign organizations:

• JIS L 0888 B Light and perspiration color fastness test methods
• AATCC 125 Color fastness to slippers and light test procedure