This cross has been back crossed for a darker green egg. They are not technically a F2, although I do refer to them as that becaue more people are familiar with that term. The parents in this combonation are a Black Copper Marans rooster and and easter egger hens lay a light green egg. Each of these hens hold the blue egg gene, and when crossed back to a dark egg layer it yeilds a darker green egg.
The eggs recived are significatly lighter than the eggs the offpsring will lay, so dont worry when you open your package! You got the right ones :)