French Blue Copper Marans are striking with all the traits of the French Black Copper Maran, with prettier colors and a slightly lighter egg color. That said, these girls make up for that with their wonderful, friendly personalities. Friendlier than the Black Coppers. The hens will vary in feather color from lighter blue to darker blue. The great thing is that you can run blacks and blues together and still have purebred blacks and purebred blues. The blue color gene is a variant of the black gene. Blue is a dilution gene it dilutes out the black to a gray. When you breed blue on blue you will get some splash Marans. 
Note: Breed example photo