Ethyl 8'-apo-caroten-8'-oate serves as a versatile dye used across various domains. In biological experiments, this compound assists in observing and analyzing cell structures, tracking biomolecules, evaluating cell functions, distinguishing cell types, detecting biomolecules, studying tissue pathology, and monitoring microorganisms. Its use extends beyond basic scientific research to include clinical diagnostics, textile dyeing, functional textile processing, food pigments, and dye-sensitized solar cells, showcasing its broad application in both traditional and emerging fields.