Thanks sparklee, that is what I read somewhere. If EE to EE make EE is it still a chance of any color eggs?
The basic genetics behind the color of eggs is real simple. It's putting it into practice that becomes tricky. That's mainly because the blue egg gene is dominant. Since it is dominant, if just one of the two genes present is blue, the hen will lay a blue or green egg. You don't know if a recessive white is present or not. And since roosters don't lay eggs, you can't tell by looking if he has any or not.
There is only one pair of genes that determines base eggshell color, blue or white. There are a lot of genes that influence brown. Green is just brown on top of blue. Think of it this way:
Base blue plus no brown = blue
Base blue plus brown = green
Base white plus no brown = white
Base white plus brown = brown
The exact shade of brown or green depends on how much brown is put on top of the base color.
Since EE's are a mix, you don't know if the chicken has any blue genes or not. If the hen is laying a blue or green egg, you at least have a dead giveaway that she has at least one, but you really can't be sure of an EE rooster unless you really know the flock genetics. If either parent has two blue genes you are home safe, the eggs will be either blue or green. But if both parents are split where they have one blue and one white, about 1/4 will not lay blue or green eggs. If one is split for the blue/white gene and the other does not have any blue egg gene, then about haf will lay blue or green eggs.
If you only hatch blue or green eggs, then there is at least a 50% chance a pullet from that cross will lay blue or green eggs. If the hen has two blue genes or the rooster has at least one, your odds go way up. But without knowing the genetics of the parents, its really hard to give any guarantees of what will happen.