This standard specifies a unified test method for determining the resistance of various textiles, particularly when stored with wrinkle-resistant finished fabrics, to the effects of formaldehyde gas. The method simulates a formaldehyde gas environment to assess the degree of color change in the fabric. After the test is completed, the color change of the sample and the staining of the adjacent fabric are rated according to the gray scale. In testing laboratories related to this standard, formaldehyde testers are often equipped to accurately measure the formaldehyde content in textiles to assist in evaluation.