Pretty sure they cannot carry blue. Blue has to come from blue or splashthe beginnings of chocolate mottled bantam cochins.. 3rd generation cochin. The black one is an obvious by product of the chocolate project... but, where did the blue come from??? It's definitely part orpington so didn't come from my blue mo. cochin pen. I think the mother must be carrying blue and that her father could possibly be a blue mottled... haven't seen any mauves though.