This procedure is used to standardize visual evaluation of staining due to colorfastness tests. It is not intended for evaluating color change of white or light-colored materials. For instrumental assessment of staining, refer to AATCC EP12, Evaluation Procedure for Instrumental Assessment of Degree of Staining. The colors of AATCC Gray Scale color chips are the same as those specified in ISO 105-A03. This evaluation procedure describes the use of a Gray Scale for visually evaluating colorant staining on a control material, resulting from colorfastness tests of a colored textile. To determine if a Gray Scale is still suitable for use, see Appendix A. Staining due to any colorfastness test may be evaluated.