Widely used as a red dye in solvent-based applications, especially in the coloring of hydrocarbon fuels such as diesel and heating oils. It helps in product differentiation and tax classification by providing a distinct red hue to taxed or off-road fuels, preventing misuse in on-road vehicles where lower-taxed fuels are restricted. Also applied in lubricants, waxes, and some plastic systems where solubility in non-polar media is required. Its stability in high-temperature and low-polarity environments makes it suitable for industrial marking and quality control in fuel distribution networks.