If breeding them together, you'll get some whites... all the offspring of the whites will be carrying 1 copy of white... chances are some will get no copies of white, some 1 copy and some 2 copies... depends on if the male you pick is from a white parent or your BBS's... and no way to tell that without test breeding each one to a white...
I was planning on separating them for breeding but someone wanted pet Silkie chicks. Due to some other issues they may be staying here though.