1, the hub is often exposed to sunlight, rain, dust and other environments, and these factors will affect the color of the hub, especially the ultraviolet radiation in the sunlight, which will lead to the oxidation and fading of pigment molecules.

2. The fading of warm paint wheel hub is related to the pigment quality. If the pigment used is of poor quality or not resistant to high temperature, it will gradually fade after a period of use and exposure to the external environment.