Only L’Oreal Paris, the inventor of permanent hair color, could reinvent it. Introducing Colorsonic, the next generation of at-home hair color, the best color of your life at the press of a button. How it works: Pick your shade, pop it in the device, & press for color. Colorsonic makes hair coloring easier by automatically mixing and depositing formula right at the root to deliver long-lasting salon inspired hair color at home. The device parts and saturates every hair strand and distributes color evenly, even in hard-to-reach areas. The multi-use hair color cartridge delivers up to 3 applications per cartridge (3 root touch ups or 1 full head application). What you don’t use, you can save for the next time.