what color would you call this Polish chick?

[Chicken5555]

Hey guys. I hatched some wc Black and wc blue chicks from a friend's wcb/wcB Polish pen. One chicks is different. This link has more info if you would please head on over to that thread and look at post #1375 and answer my question. One person suggested it's a mix breed, others think recessive genes, another suggested mixed variety. If you've had a chick hatch like this from wc blacks or wc blues I'd love to see how they feathered out. Thanks!

https://www.backyardchickens.com/t/927652/color-genetics-thread/1370#post_18440253