Used as a dye intermediate in the production of vat dyes, particularly for cotton and other cellulosic fibers. It imparts excellent lightfastness and washfastness to textiles. Commonly employed in the synthesis of blue and green anthraquinone-based dyes where strong color and durability are required. Also utilized in specialty inks and coatings where stable, vibrant coloration is needed under prolonged exposure to sunlight.