L'Oreal Professionnel DIA Light Ammonia-Free Demi-Permanent Gel-Creme Haircolor is the first acidic tone-on-tone color that creates glossy luminous looking reflects and vinyl shine whilst respecting the condition with natural-looking color that gradually fades away. Ideal for previously colored or weakened hair or even for those that just want to add a subtle richness or gloss to their natural hair color. DIA Light is great for offering a color refresh to top up the vibrancy of your color in between your usual permanent color services.