Fading Egg Color?

[Marct611]

Over the last few weeks all my eggs have been going from a nice medium brown shell to almost a light creamy brown now. Any ideas why? All 10 hens are doing it. All I can figure is too much scratch grain and they must not me eating enough layer crumbles. Thanks

 

[babyrnlc]

My olive egger turned into a sage egger. I would love to know the answer to this too.