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AATCC Test Method 6-2011 specifies procedures for evaluating the colorfastness of textiles to acids and alkalis. The method is applicable to all types of dyed, printed, or otherwise colored textile yarns and fabrics. It assesses a material’s resistance to color change when exposed to simulated acid fumes, alkaline cleaning agents, and other common acidic or alkaline substances. The test involves applying specific chemical reagents, such as hydrochloric acid, acetic acid, ammonium hydroxide, and sodium carbonate, to textile specimens through spotting, steeping, or fume exposure. After the treatment, the change in color is evaluated visually by comparing the specimen to the AATCC Gray Scale for Color Change or through instrumental assessment. The result is reported as a numerical grade, indicating the material’s durability against acidic and alkaline contact, which is crucial for predicting performance during use and care.