I am wanting to breed blue and black orpingtons. But i was also wondering about adding whites to the mix what color would the offspring be if i kept them all in the same pen. thanks.
Blue orpingtons can hatch - blue, black or splash.
White orpingtons can be dominant white, recessive white, or a combination of both. White hides color.
You will get a jumbled mix of color, some blue, some black, some splash and white will have some color bleeding through.
As hard as good whites are to come by you should consider a white breeding pen separated from the blue/black/splash pen.
If youmix them up they will all be orpingtons but non-standard colors. They won't be pure colors and alot of people will be angry if they by a white looking orpington and it throws colors and ruins their breeding hatches.