I collected eggs the other day and one of the French Black Copper Marans eggs was weird- like it had a film on it. I thought at first it was a weird BR egg but when I wiped it off it was obviously a Marans egg. After drying though it took on the previous white film across it which disappears with moisture and returns when dry. Any ideas? It changes color even from being held in your hand (I am guessing the moisture from the skin). This is the first one I have gotten like that. Picture shows normal marans egg on left, weird marans egg in center and BR egg on right for color comparison Same eggs but after the weird egg was damp Hens get layer, free range and access to oyster shell. The shell looks fine otherwise- not soft or malformed. Thanks!