Used as a reagent in analytical chemistry for the detection and quantification of aldehydes, particularly in the determination of formaldehyde in air and industrial samples. It is also employed in histology and microscopy as a staining agent for lignin in plant tissues, enhancing the visibility of cell wall structures under light microscopy. In pharmaceutical applications, it serves as an intermediate in the synthesis of certain drugs and as a spasmolytic agent in some medications for gastrointestinal disorders. Additionally, it finds use in the production of dyes, resins, and polymers due to its reactive aromatic structure.