Procion Yellow H-E 4R serves as a versatile dye utilized across various domains, including scientific research and industrial applications. This compound facilitates the observation and analysis of cell structures, tracking of biomolecules, evaluation of cell functions, differentiation of cell types, detection of biomolecules, investigation of tissue pathology, and monitoring of microorganisms. Its uses are not limited to scientific exploration but extend to clinical diagnostics, traditional textile dyeing, and innovative areas like functional textile processing, food pigments, and dye-sensitized solar cells.