I can tell you now in all seriousness... it doesn't. I'd be interested to hear what you think. Although it looks yellow in the tin, it never seems to turn the shoe yellow. As I mentioned earlier, just gives it a lift and some sparkle. Now that I think about it, I can't remember when I last saw a pair of yellow shoes. No doubt some smarty-pants will now post a picture of yellow shoes Patrickbooth has reminded me, I must investigate that Glenkaren stuff one day.