Yes, but Marcel is not using them in his Dutch strain. They are just there, but do not come near the type they should be and would be disqualified at shows. Those German eggs are horrible and their Welsummers are quite different from the Dutch ones in type and color, I believe they are genetically different. My Welsummers lay not as dark as those on the plate, maybe in the beginning (pullets) but not all the time. I would also not outcross to a british production type welsummer, because all the other downfalls outweigh the nice egg color and I do not think I live long enough to put that dark egg under one of my hens, if you know what I mean. Red Cap, do you live in North America? The only wyandotte I heard of being used was by the breeder Mr. Oskam, he made the double laced blues. That's a whole other story though.I have two pretty eyes in my head. Furthermore I know some show judges, and poultry photographers, who briefed me in such things.
I've got Welsumer as teenager from one of the best breeder in Germany, but their eggs had this color
compare with this
http://www.welsumer.com/index_kunstbrut.php
My Barnies deliver the same poor color
and now compare with my scottish strain ... eggs are from July 2013 after 9 months laying period.
That's the reason why this dutch breeder made imports aswell
http://www.nut-welsumer.nl/Het Welsumer Ei DE.htm
Do You know, the reason why the english breeder has still this dark eggs?
They are not to shy to make crossings with Marans. That's a No go for mainland breeder, but consequently the dead for their breeds regarding "egg performance".
New blood is necessary today as it was usual untill to the 1940's. Then the psycho hype of pure breeding began ... or what was still worse, if new blood was introduced, they uses light egg layers, like Wyandottes in the Barnies.
Can You show eggs of Your double double coffee eggs? As far I know from historical reports, they should look like my scottish Welsumer eggs or darker.
Piet