Many readers have inquired about the state of their brows in relation to their hair color. More specifically, when is it necessary to dye them? It may be tempting to color brows after you’ve made a drastic change in hair color—like, say, if you’ve gone from brunette to blonde. But the truth is that you don't have to be so matchy-matchy. Here’s the rule of thumb: If you can find the shade of your eyebrows somewhere on your head, you don’t need to dye them. So if you highlight your brown hair, chances are your dark brows won’t need to be lightened. They’ll just add a bit of dramatic contrast.