Widely used as a dye in the formulation of gasoline and diesel fuels to enable identification and differentiation of fuel grades. Helps in color-coding fuels for tax purposes, such as distinguishing between on-road and off-road diesel. Also applied in solvent-based systems where a red colorant is needed, including in some industrial oils and lubricants. Its strong tinting strength and solubility in hydrocarbon solvents make it suitable for use in automotive and petroleum industries. Used in trace amounts due to high intensity, ensuring visibility without affecting fuel performance.