This professional hair treatment serum is specifically formulated to enhance and maintain the vibrancy of blonde, bleached, or gray hair, helping to neutralize unwanted yellow and brassy tones. The Purple Blue Glow formula works to cool the shade, resulting in a brighter, illuminated finish. Apply a few drops to dry or damp hair, focusing on mid-lengths to ends. This serum helps to smooth the cuticle, reduce frizz, and add significant shine without weighing the hair down, making styling easier and protecting against daily environmental stressors.