L'Oreal DIA Light 9.3 50ml. Tone-on-tone hair colour ideal for previously coloured or weakened hair. L'Oreal's first acidic tone-on-tone colour creates glossy, luminous-looking reflects and vinyl shine whilst respecting the condition with natural-looking colour that gradually fades away. Ideal for previously coloured or weakened hair, or even for those that just want to add a subtle richness or gloss to their natural colour. DIA Light is great for offering a colour refresh to top up the vibrancy of your colour between your usual permanent colour services.