Under most circumstances, red fades the fastest of all visible colors. Short-wavelength light such as blue or violet has greater energy than lower-wavelength light, and red has the longest wavelength of visible colors. Red objects reflect red light but absorb harmful, energy-rich, short-wavelength light.
Many factors contribute to fading processes, including the physical and chemical structures of the object, the type of dyes or pigments present, the amount and intensity of light, and the temperature and humidity of the environment. When light, particularly ultraviolet light, which has a very short wavelength, hits an object, the energy contained within interacts with the exposed surface. The new energy excites the outer molecules of the object causing chemical bonds, thus reducing the vibrancy of the color and the strength of the object over time. Color and molecular damage can never be repaired.