Chlorine bleaching fastness or chlorine bleaching fastness tests are carried out in order to determine the color sensitivity of textile products against active chlorine in various concentrations used in dyed or printed textile products for disinfection purposes.

During chlorinated bleaching fastness tests, three different solutions are used: hypochlorite solution, potassium dihydrogen phosphate solution, and disodium hydrogen phosphate dihydrate solution. When evaluating the test results, the gray scale used in the fading evaluation is used to determine the color change (TS 423-2 EN 20105-A02 Textile - Methods for determining color fastness - Section A02 - Using the gray scale for the evaluation of fading).

Fabric samples are examined in the light cabinet under D65 daylight to assess shade and color differences under reproducible conditions. The aim is to control the product under an illumination capable of providing daylight suitable for natural conditions. There are different light sources in the light cabinets according to customer demands. These light sources represent D65 daylight.

Chlorine bleaching fastness tests are carried out by authorized laboratories in accordance with the criteria and standards published by national and international organizations. These laboratories are accredited by national or international accreditation bodies in accordance with the standards of TS EN ISO / IEC 17025 General Conditions for the Competence of Testing and Calibration Laboratories.

Chlorine bleaching fastness to determine the color changes of textile products after chlorinated bleaching is determined according to the following standards:

• ISO 105-N01 Textiles - Color fastness tests - N01 Section: Bleaching fastness: Hypochlorite
• TS 739 EN 20105-N01 Textiles - Color fastness tests - Part no 1: Determination of color fastness to bleaching with hypochlorite

Bleaching or bleaching is the first step of dyeing in the textile industry. Thanks to this process, the colors applied to the fabrics become more bright and vivid.