Health and Beauty Coloration L'Oréal Professionnel Dialight Semi-permanent Coloration Without Acid technology for sensitized hair.An ammonia-free and odorless tone-on-tone coloration to personalize hair color (medium and long). What are you doing? Helps to obtain perfect reflections with an infinite shine. It can also be applied to natural hair to give bright and luminous reflections like a shine bath. How does it work? It revives the color of the hair and can create new shades on top of the main color. How to use: Step 1 For its application, mix a tube of Dia light coloration with Diactivateur. Step 2 Mix until you get a homogeneous creamy texture that is quite smooth. Step 3 Apply to roots and lengths, if necessary. Step 4 Exposure time for 20 minutes.