L'Oreal Preference Mousse Absolue Natural Medium Brunette is the 1st reusable permanent hair colour. Mousse Absolue is reusable, ready-to-use and delivers multi-tonal flawless colour at the touch of a button. The unique two-chamber system freshly combines your colour diffusing a rich, non-drip mousse for a precise and easy application. Mousse Absolue's reusable system allows you to apply colour all over your hair, touch up roots or even target stray greys. Perfect Grey Coverage.