@TJAnonymous you can also check the dark eggs - when you crack open a dark egg, peel back the membrane. A blue egg is blue all the way to the inside of the egg. Hard to tell when membrane is over the shell. A brown egg has a white shell, so the inside of the shell (under the membrane) is white.Do you know the genetics of your easter eggers? They aren’t a breed, nor are olive eggers, and won’t reliably lay blue eggs. Maybe the Marans eggs are too dark and a lighter brown laying breed would be better to cross for green or olive eggs.