L’Oréal Professionnel Dia Activateur 4.5% 1000ml is a professional-strength developer designed specifically for use with L’Oréal Dia colour systems, offering enhanced activation for stronger colour intensity and improved coverage. Ideal when a little extra lift or deeper tonal result is required, this 4.5% activator supports richer colour deposit and reliable performance while still delivering a natural-looking finish. Its creamy consistency ensures easy mixing and smooth application, helping colour spread evenly through the hair for consistent development from root to tip. Perfect for more noticeable tonal changes, boosting vibrancy and enhancing overall colour result, Dia Activateur 4.5% delivers salon-quality shine and refined tone. Supplied in a generous 1000ml bottle, it’s a practical essential for busy salons and professionals who need consistent, high-performance colour activation.