Used historically in research as a model azo dye for studying dye chemistry and colorfastness properties in textiles. It has been employed in the development of colorimetric methods for detecting certain chemical substances due to its distinct color change characteristics under different pH conditions. Also served as an intermediate in the synthesis of more complex dyes and pigments. Note: This compound is not used in commercial dyes for consumer products due to toxicity concerns and has been largely restricted to laboratory research settings.