This professional hair color component is designed for precise tonal adjustments and personalization of hair coloring results. The 'Mix in Vert Froid V511' offers a cool green base, ideal for neutralizing unwanted warm tones or achieving specific cool fashion shades when expertly mixed with primary permanent hair color. Utilize this demi-permanent additive only in conjunction with the compatible L'Oréal Professionnel permanent hair color system to ensure optimal color uptake and longevity. This formulation supports professional stylists in delivering highly customized and consistent color outcomes.