Cationic red GTL is a versatile dye widely utilized in various fields. In biological experiments, it serves as a crucial instrument for observing and analyzing cell structures, tracking biomolecules, evaluating cell functions, distinguishing cell types, detecting biomolecules, studying tissue pathology, and monitoring microorganisms. Its applications span from foundational scientific research to a broad array of clinical diagnostics. Additionally, dyes like cationic red GTL find extensive use in traditional applications such as textile dyeing, as well as in novel areas including functional textile processing, food pigments, and dye-sensitized solar cells.