For what it is worth, when we had the rooster we called \"golden\", we kept a few of his mixed chicks that we hatched out using the buddy system, (because we have such a time candling Ameraucana eggs), we had a couple from our Buff orpington hen, and what hatched were beautiful buff chicks, that grew up nicely, having a deep rich buff color. however because we knew nothign about breeding, and knew they were half breeds, we sold them at auction in the fall, so have no idea what their next generation might have produced.
But maybe the information can be helpfull in devreloping a deeper ritch buff color, as I imagine the white genes are bleaching out the color??