Dia Light is a demi-permanent, ammonia-free hair color from L'Oréal Professionnel, designed for enhancing tone, adding shine, and refreshing color without damaging the hair. Ideal for color-treated or sensitized hair, Dia Light provides luminous, glossy results while improving hair texture. Its acidic pH formula gently blends tones and adds a reflective finish, making it perfect for toning after lightening or for subtle color changes.