Digeroo
Although mine are in a run - I do let them out to forage when I am around - but I actually read the label on their "non organic" food which informs me that colouring is added!!!
So - although they lay brilliant eggs with dark yellow yolks - that may not be because they are able to eat greens!!
I would never again go back to "shop eggs" though - they do taste different - and are much much nicer!
Old Bird