Fibromelanotic chicks?

[AbL]

I'm new to black colored breeding, so I hope you may have some answers for my questions.

I recently got a black faced black japanese bantam and a chocolate bantam hen. They were with, I think a black or chocolate or fibromelanotic rooster where they came from, so I collected the eggs of the first week and put them in the incubator. Yesterday two black chicken hatched.
I think it's the chocolate one who laye, not the blackface. But she has also some dark shades in the combe and the roosters I saw were dark combed too.

So any chance my dark chicks might have black face and/or chocolate genes (when I got it right, a black male could be split for chocolate) ?

Are fibromelanotic chicks always solid black at birth or can they have lighter parts (in this case juste the toes)?

Here are the two hens in question and the two chicks (does others might hatch on Monday, one of them I am sure they are from the chocolate hen).
The lighter chick is more slate by comparison with the solid black but has tiny white wing feathers. The solid black has dark legs, just the last third of the toes is light skinned.

Do fibromelanosis comes "diluted" or is it always black black?

 

[MayBerg]

OMG, THOSE BABIES ARE TOO CUTE.

 

[Rock17]

Fibromelanistic genes can become melanistic in a cross (Fibromelanistic chickens also have black organs and dark red/ purple blood).

 

[Rock17]

Ps. Melanistic is kind of the opposite of albino

 

[Rock17]

The lighter parts may be fibro, but they indicate normal melanistic instead

 

[AbL]

OMG, THOSE BABIES ARE TOO CUTE.

Yes they are!

 

[AbL]

Fibromelanistic genes can become melanistic in a cross (Fibromelanistic chickens also have black organs and dark red/ purple blood).

The lighter parts may be fibro, but they indicate normal melanistic instead

So are there black chicken which are not fully fibromelanistic, where just the skin is black , not the interior?
I don't know if they crossed yam cements or similaire into the bantams to get this effect or by classic selection of chicken with blacker skin.
Funny enough, I saw today the little one has also with feathers on the wings. I read somewhere that may occur in black chicken or maybe it's very common and they will lose this in the ext mod, by I'm not sure anymore.