Add water. Before you rinse out the color, sprinkle a little water on your head and mush your hair around with your hands for a few seconds. "It emulsifies the dye and moves it all around so you don't end up with any lines or streaks," says Ionato. Tweak the results : After your hair is dry, if you're unhappy with the color, you can mute it by applying a deep conditioner to damp hair. Then cover your head with plastic wrap and a hot, damp towel. Leave on for 20 minutes (at ten minutes, blast your head with a blow_dryer), then shampoo and condition your hair. If you're still not happy with your shade, well, it looks like you're heading to the salon.
Know when to go lighter or darker. The rule is as follows: For permanent dye, choose a color a smidge darker than what you want because of the strong developer, says Ionato. With semipermanent dye, however, err on the lighter side of the color you're looking to achieve. "Semipermanent formulas don't have a developer, meaning they get darker and darker the longer you leave them in your hair," says Ionato. "It's safer to choose a color that's a bit lighter from the get_go."