Yes BBS. Short answer: yes expect blacks with BBS colors but don't be surprised if a few might show some off-color on necks/saddles.
Black is dominant and usually doesn't hide anything, unless they were part of projects such as lavender or they were freely mixed color-wise in which case they could be not pure blacks carrying wheaten or partridge... those usually show some gold or silver lacing on hen's necks/breasts or on the hackle/saddle zones on roosters.
Crossing two blacks of different breeds can sometimes give surprises such as blacks with color on necks/breasts/saddles. This is because there are two common different genetic 'blacks'*. One black doesn't need much helper genes to turn them totally solid black, the other common black is based on birchen and this needs more helper genes to turn them solid colored so if you cross these two, some birds may be birchen and not have all of the helper genes.
