First, the blue color is white recessive and blue dominant. You get a blue shelled egg if there is at least one blue. Both of the parents in your example could have only one blue. The rooster could have both recessive white.
In Genetics, a dominant gene takes over the expression of the trait...
Large fowl will rest their breast on the board and tuned to the narrow side can sometimes cause injuries. Keep an eye out for that. I had a pulled develop a nasty infection from a round roost board that I have in a hutch.
Turned the narrow way is fine for bantams and small breeds.
I found a blog article that has good writ up about egg formation:
Quote: https://hencam.com/henblog/2012/02/brown-green-blue-white-chicken-egg-color-the-real-story/
The bloom or cuticle must pick up some of the pigment in some hens. That would explain the color change. Bloom is also hard to...
It still sounds like something to do with the bloom. Does it go back to green when the egg is dry?
Keep us posted on future eggs from that pullet.
There is something very different about that egg!
I have had eggs look green in the sun and then brown under fluorescent lights. My guess would be light spectrum or something to do with bloom. Bloom will change color too.
Marans are much easier to get than Penedesenca. Penedesenca roosters have very big combs but would still work for you in Washington state Unless your are in the Eastern part that gets cold in the winter.
I hatched the Marans late in the summer and they have just started laying very dark brown eggs. The cross should make a very nice Olive colored eggs. I also have a couple of Penedesenca hens that are still of laying age and those will make very pretty eggs too when crossed with the UofA blue egg...
Depending on what breeds you have, you may not see many eggs until January because of low light. Adding light can get them laying again but not as much as spring and early summer production.
Most breeds used to make OEs are not winter layers.
Note: a lot of breeds will lay through the first...
You will get green and white eggs mostly. The leghorn will have two white egg shell genes. The OE hens will usually only have one blue and one white. That leaves the chance that some hens will have two white egg shell genes and will lay white or brown eggs.
Leghorns have a brown coating...
The sell is always blue or white. If the shell is porous, the brown will leak into the shell making the inside look green too.
I have a vague memory of posting about this some time ago. There can only be a blue or white egg shell. It is the way genetics works with chickens.