Fluorescent brightener 210 is a versatile dye that plays a crucial role in biological experiments by aiding in the observation and analysis of cell structures, biomolecule tracking, and cell function evaluation. It helps distinguish cell types, detect biomolecules, study tissue pathology, and monitor microorganisms. The applications of this dye extend from fundamental scientific research to a broad spectrum of clinical diagnostics and are widely utilized in traditional areas like textile dyeing, as well as in innovative sectors such as functional textile processing, food pigments, and dye-sensitized solar cells.