White skin evolved over time

It seems that we were all black (consistent with evolutionary fact that the first human being in Africa). White skin was a result of humans moving away from the equator. Also all skin, no color may appear white cream. Near the surface blood vessels add a pinkish hue. A yellow pigment also tints the surface. Finally melanin sepia tone, created in response to ultraviolet rays, appears black in large amounts. These four hues mixed in different measures created skin colors of all the peoples of the earth.