Naturally Hatching Eggs!

[DWClay]

Oh yeah, the fact that she is solid black and none of the others are… will make it more difficult for mom to recognize her as one of her babies. Darn it!

I was afraid of that. Oh well hand, raising it is! Not part of the original plan, but nature has a plan of its own! at least she has fully accepted everyone else, and I don’t have to raise all of them on my own! Now the fun part of stealing one of them from her!

 

[ChickenCanoe]

While they do detect color and have excellent eyesight, I've raised hundreds of broods with hens of solid colors and various mixes. I never detected that they really cared about the color of the chicks. Most birds are like that. Many species of birds will raise a chick from a cuckoo egg volunteered to their nest resulting in a chick that is much bigger than the adoptive parent.
Chicken hens have always volunteered eggs to a broody nest. For that reason, they never have any way to know who the parents of their hatchlings are. This is built into their genetic DNA. For that reason, they will raise and care for any chick that hatches out of their nest. That means they may or may not adopt chicks added later. That depends on their urge to become mothers. I've had hens who had not been broody adopt as many as 25 chicks of various ages, only because they had the propensity to raise a family. I've even had lone cockerels adopt and mother chicks protecting them with the same aggressiveness of a mother hen.
ETA
I think that is one of the many differences between birds and other egg layers and mammals and other live bearers. A mammal can know exactly who it's offspring is/are.
The desire to raise a family in birds is a hormonal change.