Hen lays blue eggs, suddenly lays grey eggs?

[McChooky]

A brown egg(Not talking olive though), can have brown pigmentation inside the shell to on occasion under the membrane. Sometimes it's pigmented all the way through rather then painted on.View attachment 3970125

I've heard the brown egg gene only tints the outside whereas the blue egg gene goes all the way thru.Interesting fact for breeders

 

[EmmaDonovan]

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I have 5 generations of gray egg layers.
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People don't wash a black copper maran egg before taking a pic. So enjoy that gray egg. (Also there are 2 kinds of eggs. Matte- which has heavy bloom, and glossy.)
I will admit this purple egg below was bloom. I wish I had more pics of it, if you have a neat egg, get lots of pics.
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Those are gorgeous!

 

[MysteryChicken]

I've heard the brown egg gene only tints the outside whereas the blue egg gene goes all the way thru.Interesting fact for breeders

Some of my birds that lay brown eggs that are brown all the way through. Planning to experiment with this, & combine with the blue egg gene, & possibly make a true olive.

 

[Chubbicthe2nd]

Well, the mystery is solved. She laid blue eggs before her system really got going, and now she has a sort of Gray outer coat to the eggs that sometimes veers into olive green. When I cracked open a fresh egg of hers, and peeled off the white membrane, sure enough it was blue underneath the shell.

I think when she was first laying for the first couple weeks, the eggs were such a brilliant blue because it was the first egg she had ever laid. She had so much blue dye it actually died the membrane inside as well. It was just because her system wasn't calibrated I guess. I guess I would call her an olive egger now.