Everyone of course has different undertones and contrasts with the colors, so it's important to be able to try it on," Madeline Poole, Sally Hansen's global color ambassador and trend expert, said. "You might try on a shirt. It looks amazing on a rack, but when you try it on, it washes you out, or it doesn't bring out the color of your eyes or your hair or whatever, so it's the same kind of concept.