L'Oreal Professionnel Majirouge Mix+ Hi Chroma Mixer Additive 1.7oz COPPER L'Oreal Professionnel Majirouge Mix+ Hi Chroma Mixer Additive offers a Copper color to your hair. This would be the best option for those who want to look striking and trendy. It gives ultra-conditioning with auto-protection. Hi. Chroma colorants allow visible color results on dark natural or dark-colored hair.