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Those are from 'pure blues' as in BBS Marans lol. I got them from peachick here on byc. She posted some pics a few weeks back on the Marans thread somewhere (huge thread)with pics of her birds and the egg color she is getting now. Her egg color is about the same as what my girls from her are laying..so pretty consistant through the generations. I think she is doing a good job. My blue coppers usually lay a little darker than these.
Flgarden, this came up on the main thread, and we discussed it for a few pages. Her blue marans are not from BBS lines. From what we could determine they are Blue Coppers with all the copper covered up. She says on her egg sale: "I developed my blue line from coppers and not cuckoo, so egg color is great. It's taken a few generations but my roosters are now free of any coppering in hackles.... " She said she started with a Blue Copper rooster to a solid black hen. But she did not say that the hen was not BCM. Given the dark egg color, I'm guessing it was a BCM with no copper, which is pretty common. So she bred in extra melanizers to eventually completely cover the mahogany areas of the Blue Copper. This has been done in other breeds as well, the Black leghorn is also Birchen based.
So what this means is that your Blue Marans will probably have more melanizers than your average E based BBS. They will also likely carry Mahogany, which you don't want in your Wheatens. Even if you get wheatens from your F1 crosses, they may still carry extra melanizers and mahogany that you don't want in Wheaten. As it took Peachick a few generations to breed in the extra melanizers, it will probably take a few generations to breed them out.
I think this is the kind of thing that Don was worried about, with Blue Wheatens carrying extra genes from the cross that created them. Projects like yours (bluexwheaten) are intriguing to me too, but sometimes you find things in the mix that you didn't know you had.
Village C. yes that is what I tried to get accross but the egg sellers ignored what I was trying to say. I have basically tried to say what is genetically possible has nothing to do with the type of fowl that will result. Lots of success to you in your hobby, Don