Acid Red 266 is a multifunctional dye utilized in various fields. It serves as a crucial tool in biological experiments by aiding researchers in observing and analyzing cell structures, tracking biomolecules, evaluating cell functions, distinguishing cell types, detecting biomolecules, studying tissue pathology, and monitoring microorganisms. Its applications extend from basic scientific research to a broad spectrum of clinical diagnostics. Additionally, Acid Red 266 is widely employed in traditional sectors like textile dyeing, as well as in emerging areas such as functional textile processing, food pigments, and dye-sensitized solar cells.