I agree with @Jayne that it could be the minerals in the water or pollution that could be slightly coating the color of the wig. Unlike human hair, synthetic wigs aren't supposed to alter color really at all - which is the nice thing about them! What hair care products are you using on your Winner?
Tori by Rene of Paris is a standard synthetic wig, so we do not recommend using a curly iron on this style. Some of our clients will use steamers on very low heat on their wigs to help style their pieces. But like