WOOT! YIPPEE, I'm SO excited that your little single combed blue girl lays OLIVE, Neeley! WOOT! Now that's worth the wait, eh?
MM - I think your "piggyback" anology is correct, but I'm not sure. I don't know that we can know without some test breeding!
As far as the "blend" of my olive eggers, the momma to most was a Penedesenca X Marans, then the eggs I sold were those offspring bred back to the Marans rooster (who hatched from an extremely dark egg). I was unhappy with the golden overcast to the eggs, though the color was different & IMO, pretty. I really have been after a true, dark olive color. So, I decided to sell most of my stock & sort of go back to my first generation.
She was a beautiful girl that laid very speckly, medium green eggs with a golden cast - I've posted some of her eggs before, but here's another pic:
I sent her to a friend who had a gorgeous, purebred blue ameraucana that comes from a green-egg laying line. Hatched a few, kept the pullets, and I now have 3 of them - they are black, so they must be carrying the recessive blue (meaning subsequent offspring "should" be 50% black, 50% blue, but you never know just what you'll get with mutts!). Here they are as 18 weekers:
My hope was that I would get a medium, TRUE olive green without that golden overcast, and one just began to lay this past week - I have gotten just two eggs from her (this time of year, it's always hit or miss with laying in my area, and I do not use lights on them), and I am very pleased with what I've seen - they are a nice, medium olive green....so, bred back to my black copper marans, the offspring should lay a VERY dark olive - hopefully, without that golden overcast. I'm uber excited to see what happens next!