Well if you look at his neck feathers and tail feathers that are colored they are blue gray. Depending on the genetic combinations, if you take the black gene or genes out , instead of getting the irratic marking you tend to get a bird that is white with a red back very similar to a red pyle. But there may still be a few gray feathers that grow in. Some people ad dominant white to them and it helps to stop any of the gray freathers from growing in and it whitens the off white and it has trouble affecting the red and it creates a intense red pyle bird. For some reason when the black genes are involve you get various types of splashes. Many white chicken breeds have pure blue under the white to make a clean pure white. Recessive white and dominant white have problems makeing a clean white and some color leaks through. So covering up a off white works pretty good. But on splashes you should see some blue feathers streaking in. I couldn't enlarge it but you can see them. The other post of blues the one roo has a large red patch on his back, so if he was a wheaten blue or lets say a pattern blue then that red patch is what gets left on the white bird. For some reason they dont splash out as much. The red brown blue leaves a gold hackle and upper back and wing in brown and the tail and under body turn white. The hens get a white tail and show white birchen markings in the neck.
If u want to see some pics of some, go to feathersite breeds and look up Empordanesa then follow the german link, translate it and click on empordanesa to see the differant colors. They are a spanish breed that comes from Catalonia where Penedesenca come from. They lay a real dark egg also, and not at flighty as the Penedesenca. Also you can see some modifications to what can be done with colors like your EE hen that you have pictured , some are near white with a black tail and the neck markings. Similar to a brama but its more of a light buckskin with the dark neck.
Many dont know about the other colors you can get with blues because the black blues are so popular. The white wheaten blues are suppose to be really like a red pyle , or at least the males are.
Sorry to jump subject a bit. But hope that helps.
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Terrie