I would think that there is a genetic reason for not being all black. Some gene not present or not studied enough to be known like the one that keeps silver from yellowing in the sun. I would love for a color like that to breed true. As we dont see it in most breeds as a color I am assuming it doesn't or that no one has wanted to try(I dont believe this).This is considered leakage. Notice the shoulder is black and only the hackle and saddle are red/leaking. I had a couple silver cockerels that were similar. This is a project that we are trying to get solid blacks by continuously breeding the blackest to the blackest.View attachment 3434866
Take my questions and speculations with a grain of salt I'm still learning and reading on genetics. I don't know that we will ever know enough about it in my life time. I love the talk tho.
