English Chocolate Orpingtons and a Dun Gene?

[ZooPro]

I have been hatching chocolate chicks from my chocolate roo and hen and I have what seems to be a light, medium, and dark variation. It's clearly three color variations. I've recently been told about the possibility of a dun gene. I'm new to chickens and I need to see pics and learn more about what this could be. Any guidance, pics, examples, info you have would be much appreciated.

 

[RoostersAreAwesome]

Do you have pictures of the parents and chicks?

 

[ZooPro]

 

[RoostersAreAwesome]

Interesting. It’s also possible that you have blue chocolates (also known as mauves) and/or splash chocolates.
@ColtHandorf @Amer

 

[ColtHandorf]

What color are the adults shanks/feet? It looks like the hen has slate and the male has white?

 

[ColtHandorf]

@The Moonshiner and @nicalandia have worked with dun I think.

 

[Amer]

Yeah, it sounds like your birds are dun as opposed to sex-linked chocolate.
Dun is incompletely dominant just like blue meaning the heterozygotes (dun) have a color in between the homozygote colors (black and khaki.)
Your birds are dun: I^di+ and I^di+
That means the offspring will be I^dI^d, I^di+, and i+i+.
25 percent black, 50 percent dun, 25 percent khaki respectively.

 

[ColtHandorf]

If they are actually dun, I'd be very interested in getting some eggs or chicks from you. But to my knowledge there aren't any dun-based Orps in the states.

 

[Amer]

If they are actually dun, I'd be very interested in getting some eggs or chicks from you. But to my knowledge there aren't any dun-based Orps in the states.

Oh and here I was thinking they were common. XD

 

[ZooPro]

Yeah, it sounds like your birds are dun as opposed to sex-linked chocolate.
Dun is incompletely dominant just like blue meaning the heterozygotes (dun) have a color in between the homozygote colors (black and khaki.)
Your birds are dun: I^di+ and I^di+
That means the offspring will be I^dI^d, I^di+, and i+i+.
25 percent black, 50 percent dun, 25 percent khaki respectively.

25% black? I have black orpington chicks from a breeder and my darkest chocolate chicks are still very chocolate when compared to the black. I'll have to get pics for comparison tonight.