List Of Oil Spill Hair Color Ideas. You do still have to somewhat lighten your hair, but not to anything remotely as extreme. Web celeb colorist cassondra kaeding reveals how to dye brunette hair rainbow!

Inspired by the inky effect of a layer of oil floating on top of water, the oil slick hair trend blends dark, iridescent shades of blue, purple, magenta, green, and red. Because this look is all cool tones, you will also want to darken the base to a dark cool brown or a cool black. Rainbow burst with dark roots.