Used primarily as a photochromic dye in specialty applications, this compound enables materials to change color reversibly when exposed to ultraviolet light. It is especially valued in the development of light-responsive lenses, security inks, and smart windows due to its rapid color transition and good fatigue resistance. Its molecular structure supports a clear shift from colorless to blue upon UV exposure, making it suitable for optical devices requiring high contrast and durability. Commonly incorporated into polymer matrices for eyewear, it contributes to automatic tint adjustment in response to sunlight.