And so if you do have darker hair, a brighter, bolder pink would be an easier color to achieve as opposed to a pastel. Also, since it can be hard to get exactly the shade you want, it is vital to pay attention to how long you're keeping that dye on. "When dealing with color, there’s really no set time for how long to leave it on," Chris Appleton , who dyed Kylie Jenner's hair pink in September, says. "You need to watch it, wipe some off the hair to see what’s going on underneath, and keep checking until you get the desired color... Less is more, especially with frosted colors."