GB/T 8444-1998 is a test standard for the colour fastness of iron and copper metals in the dyeing bath of Spinning & weaving products. The standard specifies a detailed method for testing the colour fastness of Spinning & weaving products in the presence of iron and copper metals in the dyeing bath, covering test preparation, such as the configuration of iron and copper ion solutions in the dyeing bath, the processing flow of Spinning & weaving products in the test, time and temperature control, and strict result evaluation methods. According to this standard, the effect of iron and copper metals in the dyeing bath on the Color stability of Spinning & weaving products can be accurately judged, providing a strong basis for Spinning & weaving companies to optimize the dyeing process and ensure product mass.