This is silly. A simple look at hierogplyics (sp?) shows that 1. They had black pigement for their painting, and 2. They did not use the pigment for painting themselves.
Sometimes they did. Ancient Egypt was a multiracial society. There were many blacks from Nubia directly to the south. I saw the Tut exhibit rececently and made a special point of noting skin color when possible. There was a range from almost pure white (Nefertiti) to the blackest of black. Light olive hues seemed to predominate, especially among the ruling elites.
The nuts who push the "Black Egypt" nonsense seem to be making the argument that goes: are you going to believe me or your own two eyes?