Used primarily as a photochromic dye, this compound changes color when exposed to ultraviolet light, making it ideal for light-sensitive applications. It is commonly incorporated into photochromic lenses that darken in sunlight and clear up indoors. Also used in textiles, cosmetics, light detection devices, and specialty inks for security printing, authentication tags, and novelty items where reversible color change is desired. Its fast response to UV light and good fatigue resistance make it suitable for repeated switching between colored and uncolored states. Additionally, it finds use in scientific research for studying molecular switching and photoresponsive materials.