This GIF Shows Just How Cool the Oil-Slick Hair Trend Is

Here's the thing about mermaid hair: It requires a light base or a willingness to spend a lot of quality time with bleach. Fortunately, a few months ago, a cohort of dark-haired color enthusiasts decided to create their own version of the trend, and oil-slick hair was born. Turns out bright purple, blue, and green highlights look amazing on dark hair.