What breed is the 4yr hen? Is the shape of the egg her usual shape?
This is very interesting, the color difference is alot. Thank you for the picture, that is a nice color.
Could we get a picture of the difference in color?
Have read the color doesn't change although to bloom does, so maybe she being older the bloom is now thicker? Just guessing, waiting for others to reply. You wouldn't happen the have any of these in your flock ... Welsummers, Barnevelders...