Propyl red is a multifunctional dye utilized in biological experiments for 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 fundamental scientific research to a wide range of clinical diagnostics. Additionally, dyes like Propyl red are extensively employed in traditional fields such as textile dyeing, as well as in emerging areas like functional textile processing, food pigments, and dye-sensitized solar cells.