To describe Sicilians in general as "black" would be inaccurate. There is no genetic or historical evidence to suggest that most Sicilians have a large amount of sub-Saharan African ancestry, and it is not unusual for Sicilians to have fairly light hair and skin color.
The best evidence for the ethnic Sicilian population having even 10 percent sub-Saharan African descent may be the presence of sickle cell disease in some ethnic Sicilians. The disease, and the gene that may not cause the disease in a carrier but can cause it in a child who inherits copies from both parents, is so rare among people without known sub-Saharan African ancestry that it likely indicates previously unknown ancestry from the region in an individual carrier. Research does support a sub-Saharan genetic contribution in Sicilian sickle cell carriers.