In practice it is possible to determine directly the skin colour and hence the ethnic affiliations of the ancient Egyptians by microscopic analysis in the laboratory; I doubt if the sagacity of the researchers who have studied the question has overlooked the possibility.
Cheikh Anta Diop, E. Curtis Alexander, Mwalimu Imara Mwadilifu (1984). “Cheikh Anta Diop: an African scientist : an axiomatic overview of his teachings and thoughts”, Eca Assoc
