latest Birchbox order. Seeing as it was just about to be the weekend, I decided to test it out. The colour change of Kitten Heels is subtle. You don't really notice that your nails changed colour (not as drastic as my middle school green to purple polish). It's the same bright pink but switches from cool-toned indoors to warm-toned in direct sun. The Ruby Wing line has some more variations that are a bigger change but also some other subtle ones too. They even have colour changing glitters which could be very cool as an accent nail.
Would you wear colour-changing polish?