Mix up the color according to the product directions. Just for Men comes with an included brush, though you can also apply the dye with a cotton swab. Either way, be precise and targeted with your application, covering the entire brow with an even layer of color (keep a clean cotton swab on hand to wipe away any excess that gets on spots where it shouldn't be). Brush through with a clean spoolie to blend and work the color into the hairs, then prepare to be mildly terrified by your appearance. "The dye is going to look extremely dark while it's on your brows, but don't be alarmed," says Gafni. This Groucho Marx look is not (we repeat, is not) indicative of how it's going to turn out. As a general rule, leave on for the allotted amount of time indicated on the instructions, though if you're using vegetable dye, Celaj recommends leaving it on for only a minute or so.

Wipe away the color with a damp cotton ball or pad until the dye is totally gone (this may take a few swipes). Use water only, no cleanser or cream of any kind, as those can affect the color, cautions Celaj. Once your brows are clean, assess the end result. If it's too light, go ahead and repeat the process. "It may take a little trial and error to determine exactly how many rounds of color you need to achieve your desired effect," Gafni points out. Once you're satisfied, this is the perfect time to reexamine your brow shape. The color will often bring out fine or light stray hairs that you otherwise may have missed, but can now easily see and remove, says Celaj.