Quinoline yellow is primarily used as a synthetic food dye, imparting a bright yellow color to various food products such as beverages, candies, desserts, and sauces. It is also employed in the cosmetic industry to add color to products like shampoos, soaps, and lotions. In pharmaceuticals, it is utilized to color tablets and capsules for easy identification. Additionally, quinoline yellow finds application in the textile industry for dyeing fabrics and in the production of inks and coatings. Its vibrant hue and stability make it a popular choice for enhancing the visual appeal of a wide range of consumer goods.