3,3',5,5'-Tetraethylbenzidine serves as a multifunctional dye with diverse applications across various fields. As crucial components in biological experiments, dyes enable researchers to examine and analyze cellular structures, track biomolecules, assess cellular functions, differentiate cell types, detect biomolecules, investigate tissue pathology, and monitor microorganisms. Their usage extends from fundamental scientific research to a broad spectrum of clinical diagnostics. Additionally, dyes play a significant role in traditional industries such as textile dyeing and are increasingly utilized in innovative areas including functional textile processing, food coloring, and dye-sensitized solar cells.