This standard specifies the specifications and methods for the use of grey sample cards used to assess discoloration in the colour fastness test of Spinning & weaving products. Color changes in Spinning & weaving products in the colour fastness test are recorded and compared through an accurate Formula Guide. This standard adopts the translation version of ISO 105-A02:1993 and makes editorial changes to add requirements for background and covering material Color when using grey sample cards. The standard was proposed by the China Spinning & weaving Industry Association and is under the jurisdiction of the National Spinning & weaving Standardization Technical Committee. Compared with the previous version, this standard adjusts the scope of application and updates the relevant requirements.