Changing Egg Color???

[ChickenMama6RIR]

Hi! I gave a rather "odd" question. I have ten hens. Four if them are laying. My silkie who lays a cream egg, my two Easter Eggers who both lay a green egg but one is a bit more bluish then the other, and a buff orpington (That's what she resembles.... I've done much research on the breed.) And she lays a beautiful brown egg. I have six other hens. They are 15 weeks old. Four Rhode Island Reds and two Leghorns. No one looks ready to lay, so I have counted them out. Why is my BO's egg color changing?
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This is supposedly laid by the same hen :/ Here is a picture of her.
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[Kiki]

They don't look like eggs from the same chicken to me.

 

[ChickenMama6RIR]

That's what I was thinking... I just didn't think that one of my RIRs would be laying yet....

 

[Top Rooster]

Me neither one is from her the other may be from RIR

 

[ChickenMama6RIR]

Do you guys want me to post pics if the RIRs so maybe we can narrow this down to who possibly did it?

 

[Top Rooster]

Yes that would be helpful