Black/silver rooster x red hen = red chick?

[Ylva]

I have an ayam cemani rooster and a brown barnevelder/bantam kochin hen. All of their chicks are black, but one of them seem to be black AND brown/red.
I thought all of the chicks from a silver/black rooster would turn out silver. Is there a leakage, or are there other genes than silver/gold that makes this chick black-brown?

Pictures of the chick and its parents:

 

[Amer]

Are you sure the rooster has the silver gene? It looks like gold leakage.

 

[Ylva]

No, I’m not sure he has the silver gene. He is supposed to be purebred ayam cemani (I got the AC eggs from someone else). I thought that meant he had the silver gene (since he is black), but that’s maybe not how it works?

Could it be that the chick has the Mahogany gene?

 

[Amer]

No, I’m not sure he has the silver gene. He is supposed to be purebred ayam cemani (I got the AC eggs from someone else). I thought that meant he had the silver gene (since he is black), but that’s maybe not how it works?

Could it be that the chick has the Mahogany gene?

Blacks can have the gold or silver gene (or both for males), and gold is generally more common.

 

[Ylva]

I have read some more on chicken genetics, and you are of course right - he is most likely gold, not silver. The chick looks like this now though :

Is this leakage of something, or is he showing some pattern from his mother?

 

[Amer]

The golden leakage is because he is only heterozygous for extended black and it’s additional melanizers. That is because his mother doesn’t have those melanizers.