"In time, the multiracial character of slavery in the Arab world virtually ceased to exist and became almost exclusively black. In this respect, it differed little from slavery in the New World. ... As long as slavery maintained a multiracial cast, Arab and Turkish slave owner favored white slaves over blacks in so far as work assignments and what might be called career prospects were concerned. White slave girls were preferred as concubines over black girls; and among the latter, the fairer-complexioned Abyssinians were shown partiality over their darker-skinned African sisters."