Okay so I just want to mention, being helpful
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If you want a TRUE orange mottled chicken, no black whatsoever on the bird, the best two routes to go are these -
1) Dominant White spangled. Instead of mottling gene, go with a spangled color like on Hamburgs, and use a gold bird, but also dominant white color. Here's a very nice example of such. These are truly an orange mottled chicken with NO black. If you want less white, go with the spangling found on breeds like Spitzhaubens and Brabanters.
From the Kippen Encyclopedia
2) Introduce the dun gene to a mottled/spangled chicken. The dun gene will dilute any black, and replace it with a more chocolately brown type color. This way, a normal mille fluer type colored chicken, such as Icelandics, Flower Chickens, etc - Will be orange with white mottling and some hints of golden brown in the tail and between the white mottling and normal buff-orange base feather color. Without the mottling they would be considered "Pumpkin" in color. With mottling they're essentially orange mottled
Dun does not breed true though, it breeds like Blue (BBS) and so the splash version will be Khaki, which still works nice, no black showing, but there's also black too, which makes for a normal Mille Fleur type color like with the birds shown in this thread.

If you want a TRUE orange mottled chicken, no black whatsoever on the bird, the best two routes to go are these -
1) Dominant White spangled. Instead of mottling gene, go with a spangled color like on Hamburgs, and use a gold bird, but also dominant white color. Here's a very nice example of such. These are truly an orange mottled chicken with NO black. If you want less white, go with the spangling found on breeds like Spitzhaubens and Brabanters.


From the Kippen Encyclopedia
2) Introduce the dun gene to a mottled/spangled chicken. The dun gene will dilute any black, and replace it with a more chocolately brown type color. This way, a normal mille fluer type colored chicken, such as Icelandics, Flower Chickens, etc - Will be orange with white mottling and some hints of golden brown in the tail and between the white mottling and normal buff-orange base feather color. Without the mottling they would be considered "Pumpkin" in color. With mottling they're essentially orange mottled
