This standard establishes a method for determining the hexavalent chromium content in dye products, aiming to provide a reliable screening method for hazardous substances in the printing and dyeing, leather, and chemical industries, ensuring that products comply with increasingly stringent environmental and safety requirements. Its core approach involves simulating the actual usage scenarios of dyes, employing specific pretreatment techniques to extract hexavalent chromium from samples, and utilizing high-precision analytical instruments for quantitative detection to effectively control the risk of prohibited substances in dyes. In practical testing, the primary reliance is on ultraviolet-visible spectrophotometers equipped with spectrophotometric systems or instruments with higher sensitivity, such as inductively coupled plasma optical emission spectrometers and ion chromatographs. These instruments can accurately determine the concentration of trace hexavalent chromium, providing robust data support for quality monitoring and compliance evaluation of dye products.