Fast Red TR (napadisylate) serves as a versatile dye extensively utilized across various domains. This compound is a key tool in biological experiments, facilitating observation and analysis of cell structures, tracking and detection of biomolecules, evaluation of cell functions, differentiation of cell types, study of tissue pathology, and monitoring of microorganisms. Its applications extend beyond basic scientific research into clinical diagnostics, traditional textile dyeing, functional textile processing, food pigments, and dye-sensitized solar cells, making it indispensable in both traditional and emerging fields.