Testing methods for colour fastness to bleaching with sodium percarbonate

This document establishes a standardized methodology for evaluating the colorfastness of bleached textiles specifically exposed to sodium percarbonate. It defines the essential procedures, apparatus, and conditions required to assess how well textile materials retain their original hue after treatment with this oxidizing bleaching agent. The protocol outlines the preparation of test specimens, the formulation of the bleaching solution, and the controlled exposure parameters necessary to ensure reproducible results. Detailed instructions are provided for measuring color change, including the use of standardized gray scales or instrumented color difference measurements. The standard covers various textile types and is applicable to quality control processes in manufacturing, as well as research and development activities aimed at improving bleaching efficiency and fabric durability. It serves as a reference for laboratories conducting comparative tests on different bleaching formulations and textile compositions.