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 View On One Page Photo 5 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Previous Next Start Slideshow Beauty NewsInstagramHairSally HershbergerHair Color