Majirel is L'Oreal Professionnel's ammonia-based permanent creme hair color, intended for use by licensed colorists in a professional salon setting - it is a professional-only color line, mixed with a Majirel/Majicreme developer (oxidant) immediately before application, and it is not a home hair-color kit.
L'Oreal states the current Majirel formula delivers strong grey coverage with true-to-tone, even results across its shade range, and has been reformulated with odor-trapping technology and easier mixing compared to earlier generations. Color is combined with developer at a 1:1.5 ratio and processed for approximately 35 minutes; the colorist selects the developer volume based on the level of lift and grey coverage the client needs.
As with any oxidative permanent color, a strand test and patch test are standard practice before a full application.