Used primarily as a redox indicator in biochemical assays, it helps in monitoring oxidation-reduction reactions due to its distinct color change properties. It is also employed in microbiology for staining and identifying certain bacterial species, enhancing visibility under microscopic examination. Additionally, it serves as a reagent in various chemical syntheses, particularly in the preparation of dyes and pigments. Its application extends to environmental testing, where it assists in detecting and quantifying pollutants in water samples.