The most common answers to what color paper fades the fastest include red, black and blue. In reality, it is difficult to determine which color paper fades the fastest because it depends on a number of factors.
Fading occurs when chemical reactions break down the colorants within an object. Colorants are chemical compounds that light reflects off of, causing the perception of different colors. Exposure to heat, light, air and other chemicals can cause the breakdown of colorants. Because of this, it is difficult to tell which specific color paper fades the fastest, as different brands of paper may use different colorants and thus fade at different rates.