Quinoline Yellow 2SF is a multifunctional dye with applications that span biological experiments, where it aids researchers in observing and analyzing cell structures, tracking biomolecules, evaluating cell functions, distinguishing cell types, detecting biomolecules, studying tissue pathology, and monitoring microorganisms. Its uses extend from basic scientific research to a wide range of clinical diagnostics, as well as traditional fields like textile dyeing, and emerging fields such as functional textile processing, food pigments, and [dye-sensitized solar cells].