Thus the blood of the sallower race spread south and that of the darker race north.
"The Negro"
W.E.B. Du Bois
As the earlier yellow Negro developed in the African tropics to the bigger, blacker type, he was continually mingling his blood with similar types developed in temperate climes to sallower color and straighter hair.
"The Negro"
W.E.B. Du Bois
A heavy bout of blackwater fever acquired on service in West Africa, which would have killed anyone of weaker constitution, had robbed his face of its bloom and left it much sallower, if more interesting than once it had been.
"The Yellow God An Idol of Africa"
H. Rider Haggard