Popsugar Beauty Beauty News Oil Slick Hair Color Trend Oil Slick Is the Rainbow Hair Technique Brunettes Can Wear February 11, 2016 by Jessica Cruel First Published: September 3, 2015 Image Source: Instagram user auracolorist 1 / 5 Image Source: Instagram user carlycutsmyhair 2 / 5 Image Source: Instagram user auracolorist 3 / 5 Image Source: Instagram user seangodard 4 / 5 Image Source: Instagram user dayofthedoe 5 / 5 Beauty NewsInstagramHairSally HershbergerHair Color