Color Fading in the coatings
Gradual changes in color or fading are primarily due to the color pigments used in the coating. Lighter coatings typically are formulated with inorganic pigments.These inorganic pigments tend to be duller and weaker in tinting strength but are very stable and not easily broken down by exposure to UV light.
To achieve darker colors, it is sometimes necessary to formulate with organic pigments. In some instances, these pigments may be susceptible to UV light degradation. If a certain organic pigment needs to be used to achieve a particular dark color, and if this pigment is prone to UV degradation, then fading is almost a certainty.