Matrix SoColor Pre-Bonded Permanent Hair Color 3NN Dark Brown The Matrix SoColor 3.0 Dark Brown is a permanent nourishing hair color with Kera-Protect TechnologyTM that provides long-lasting, vibrant base hair color and 360 degree keratin protection. Choose from 3 best-selling fashion base hair color shades - light brown, medium blonde, and dark blonde. HOW TO USE SoColor is the most user friendly hair color with an easy mixing ratio of 1:1.5 and 35 - 45 mins of development time and it provides exceptional color brilliance to the hair when mixed to even consistency ,applied evenly, and adequately in sections.