Thanx for that info. I haven't called him yet :-/ after her next egg I think I will, dunno what to say yet lol "hey mister! the plants I gave you are amazing, the blue egg layer you promised is a dud? maybe there was a mix up?" Lol Ug ya right I know, maybe ill let my four year old call him, ill tell her hes the one she needs to tall to about hiding her blue eggs! dang. Back on the hunt for another! Chicken math variables!
As I understand it, the coating lightens through the laying cycle so a brown egg gets lighter brown. Theoretically, then, a green egg would get more blue. Personally, I haven't noticed any difference in my green egg hen's egg color -- I see the effect mostly with the Marans.
There are different intensities of blue with some more pastel and others more vivid but I don't see any blue to that egg on my screen. I suspect either the seller lied to your face or had no idea what color egg she lays. Have you contacted that individual?