Interesting dark dinker project I've been working on...

I've been working on this project for the past few years now. The male was an import, bred him to a mojave a few years ago, produced four "normal" daughters. Bred him back to one of his daughters this year, got 3 slugs and two good eggs. Both hatchlings are extremely dark. Not sure what I'm dealing with yet or if it's codominant, recessive, or just a fluke, but I'm liking the project so far.

Photo of three snakes is import Dad on top, two of his four daughters below. The female on the bottom right was the dam to the clutch of two eggs. The hatchlings from that two egg clutch is in the second photo. He's breeding his other three daughters now so I'm hoping for some more eggs this year.