Discover L’Oréal Professionnel Dia Color and Dia Light, the professional ammonia-free demi-permanent hair colour ranges designed for toning, glossing and refreshing hair colour, each delivering up to 6 weeks of glossy colour. Achieve up to 70% grey coverage with Dia Color, with 100% true-to-tone natural reflects and 3x shinier hair. To tone, hydrate and strengthen hair after bleach, Dia Light replenishes hair with hydration and delivers nourished, glossy hair, perfect for blonde toning and colour refresh services. Shop L’Oréal Professionnel Dia demi-permanent hair colour, toners and developers for salon-quality colour, enhanced shine and beautifully refreshed hair. Compliment your colour services with L'Oréal Professionnel Serie Expert hair care, or discover the full L’Oréal Professionnel Hair Colour range here.