The Egyptians didn't always use true colors when depicting a person, especially if that person was the subject of the painting. Usually, the Egyptians followed a simple stylistic convention of rendering a male in a reddish hue and a woman with a yellow skin tone. But if they wanted to, the Egyptian artist might color a mythic figure blue or black to show their connection with the sky or the night. Sometimes, as an example, you'll see pharaohs rendered in green, the color of lush crops, to show his life-giving attributes.
But so far as I've seen, when the Egyptians wanted to make a point about a subject's race, they knew what colors to use. Normally, you find this in paintings depicting the pharaoh or his troops crushing the Nubians or the Hittites, or some other race they warred with. In depicting blacks, the Egyptians were almost comical in exaggerating negroid features: rounded heads, curly hair, triangular faces. Follow the link below to a picture of Tut smiting the Nubians, taken from small box found in his tomb. Clearly the Egyptian artist knew how to distinguish King Tut from the Africans.
http://www.hp.uab.edu/image_archive/um/painting01.jpg
I think the issue here with some of these comments, and with the protest by Mr. Asante is the believe that Africa isn’t diverse in it’s racial make-up. Not all African’s are ‘black’ African. My point was that, while not ‘white’ as some argue, or even what we call black African, Egyptians were also African, not matter what racial ‘shade’ people want to label them as.