Really? Interesting. I read differently.
I'm sorry, I don't know what or where you read that, but it states clearly in the SOP about the variation in egg color... also, the Ameraucana Breeders Club has a color chart, and any egg color that falls in that spectrum is accepted...
I raise Ameraucanas, LF and Bantam Araucanas and Easter Eggers... there is a distinct difference in the egg colors between EE's and the other 2, but some of those still do have a greenish tinge to them...