Several experimental results on successive color discrimination are reviewed to investigate human memory for color. It is shown that the successive color discrimination threshold reaches to an asymptote of a certain discrimination threshold level with a relatively short temporal delay between presentations of two colors. This discrimination threshold level is shown to be almost constant even as the temporal delay increases further, and about twice greater than the simultaneous discrimination threshold in both wavelength and purity discriminations. Some important implications are discussed about temporal characteristics and degree of the color discrimination deterioration.