Textiles; tests for colour fastness; part J01: measurement of colour and colour differences

This document establishes a systematic approach for assessing color changes in dyed textile materials through comparative evaluation. It provides a standardized procedure for examining the influence of various factors on dye stability during washing, rubbing, and other interactions. The methodology focuses on comparing the color of a treated specimen against an original reference sample to determine the extent of discoloration. By utilizing a defined grading scale, the process quantifies the degree of color shift observed after exposure to specific conditions. This approach ensures consistency and repeatability in measuring colorfastness properties across different laboratories. It outlines the preparation of test pieces, the application of standard test methods, and the subsequent visual or instrumental comparison required to assign a rating. The guidelines are designed to support quality control in the textile industry by offering a reliable means to evaluate the performance of dyes under defined stress conditions. Adherence to these protocols allows for the generation of comparable data that reflects the durability of color in finished fabrics.