Egg Color Mystery

[Buckguy20]

I have always heard that blue egg layers such as Ameracaunas and EE's don't lose any egg color as the laying season progress like the dark egg layers do.
However, today in my pen of EE's I found a big egg that was much closer to white than blue. I know all the hens in this pen lay blue eggs because I put all my EE pullets in individual pens until they layed and only put the blue egg layers in a breeding pen. The others I sold or left in my big laying pen. I have been getting only blue eggs out of this pen for six weeks.
What happened to cause this? Will it happen again?

Monty

 

[fosterchick]

I have a ee bird that lays a blue egg with brown dots on it. Once in a while she will lay a pink egg.

 

[jmofaustin]

My EE used to lay a mint green egg but recently started laying a blue egg.

 

[cookinmom]

Hey this is great to here! I had heard that if the chicken laid blue, they would only always lay blue; likewise with green. I'm very excited to know they might still pop one out in a different color now and then! I just can't wait til my girls start laying.