More likely Black refer's to Jack's hair color, it is the same as refering to the Rom (Gypsy) who the lady runs off with as Yellow (refering to asian (Indian) skin tone as in an eairlier varient 9 yellow gypsies. As the woman runs of with a Rom in most versions they are refering to Jack's hair color, in the same way as refering to someone with red hair as red so and so.
Larry