Black hair would not be thought unique to the people of ice age Mesopotamia, so that the Sumerians called themselves the black head people must mean that they were black, not just their hair (unless dyed), those Kushites some of whom moved east from Kish to Khuzestan then on to found Kususthali in the shadow of the Hindu Kush, and others to the southwest to begin the kingdom of Kush in Africa.
