According to L.A.-based colourist Katie Cartwright, the key is finding a soft tone of brown to weave into your base shade. "You can brighten a dark hair ... copper, and caramel-coloured highlights ...

But that doesn't mean you can't still have fun with your highlights. There are plenty of brown hair highlight ... to a full head of red hair? Test the waters out with copper or red highlights.

The Black Swan actress has rarely deviated from her go-to beauty formula over the years, sporting the same middle-parted long dark brown hair ... Awards red carpet with a new copper-tinged retro ...

The new look–which added a lighter auburn-hued tint to her brown ... and ombré highlights, she went for a full color change this time. Her hair featured cinnamon, auburn, and copper shades ...