L'Oréal Dia Light 9.21 Iridescent Ash Blonde Milkshake Hair Color is an acidic demi-permanent gloss color formulated to tone, refresh, and enhance color-treated or sensitized hair without ammonia or lift. Powered by a 1% Hyaluronic Acid complex, it delivers deep hydration, up to 80% more shine, and leaves hair up to 30% more conditioned. The 9.21 shade delivers a cool, pearlescent finish with iridescent reflects, perfect for neutralizing yellow and warm undertones, toning highlights and balayage, and refreshing faded color. The vegan, ammonia-free gel-cream formula provides precise, even application. Mix 1:1.5 with DIActivateur Developer and process for up to 20 minutes. Not for grey coverage. For professional use only.