Do all pure black australorps have black eyes?
Also, i have been putting a purebred black australorp rooster on her and the chicks i hatch in the incubator are mainly black but occassionally there is a brown one.
Not all Black Australorps have black eyes, but they all have dark eyes and black is the preferable color. If you are getting an occasional brown chick that means either your hen or your rooster one has something other than pure Black Australorp somewhere in its background. This kind of thing sometimes happens with hatchery quality breeds.