IMO, a better solution for the black would be a good sized red or silver grey. (silver grey preferably, since the red may cause leakage). red and sg don't have the ability to hide mutations like black and white do...The blacks are in a serious state of repair but I think there is hope but wow lots of culls. The 5th toe placement is a problem and size is also a problem. We tried some experiments with crossing our biggest white (He has some black here and there) to our best black hens. I was told black would be dominate but as I replied the 2 lines should be in good shape and breed homozygous before crossing. Looks like I was right or there is more to it than that. I can't say black was the dominate result as we have birds of all colors from those matings. The blacks need so much work I figured it couldn't hurt to out-cross because it's going to take years to get the blacks consistent and homozygous.
We got at least one color I haven't heard of yet, maybe I haven't researched enough but it's grey. I showed it to my friend yesterday and he informed me that the color is considered blue in the chicken world. So Blue Dorking?
Anyway the plan is to take the best blacks from the out-cross and go from there. May have to back cross to the blacks again but I'm hoping not...... It's a fun project though because there are really no rules outside of shape and feet.
The initial plan was to go with the white off the bat but like I mentioned earlier we have way more space than we will be able to fill with the whites this year. Next year the blacks might find themselves on the back burner here. Depends on how many premo whites we end up with this year.
And thanks HeritageHabittatFarms, appreciate the kind words.