Acid ColorsAll of our colorists have either noticed the uptick or already started brightening their color concoctions, because acid hair is the next rainbow hue to sweep the industry. Call it what you want — neon, dayglow, electric, ’80s-inspired — but things are going more Technicolor, less My Little Pony. “I think the biggest color trend will be acid colored hair,” hairstylist Christian Woodsays. Here, cult colorist Guy Tang shows us how to take pink into 2018.