Achieve a perfect result for your hair dye. The activating emulsion L'Oréal Professionnel Developer Oxydant acts as an oxidizing agent during the dyeing process. Its use in the right proportion with the permanent dye ensures una uniform coverage, helping to make the tone and brightness of the final hair color significantly more intense. It allows for a una more striking dye and, thanks to its influence on the consistency of the coloring mixture, also offers a more precise application.