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You will never see that much color difference in one hen, the base color will always be the same, Bob is quite correct in that. One thing to clarify though, you can sometimes see slightly different shades of color from the same hen. I’ve noticed it especially in the green range, and with my blue layers and slightly less in my Marans and “regular brown” layers.
Because green is a brownish layering over a blue based egg and the depth of the brown color can sometimes vary throughout the laying cycle, getting paler towards the end and having the deepest color at the beginning of a laying cycle. My blue layers also faded from a fairly bright blue when they first started laying, to a super pale, almost white blue right before they molted. I’m looking forward to seeing if some of that color returns when they start laying again.
You can also get some color changes with health and shell issues. I was getting pink eggs from one of my Isbars. She is supposed to lay a green egg, but was having laying issues and heath concerns/not thriving right from her hatch. She was producing only occasionally, and shell-less or very thin-shelled pinkish eggs for most of her first laying year, despite eating layer feed, with supplemental calcium free choice, and human calcium tablets ground and cooked into eggs as a special treat. Since her molt she has been doing much better and is now producing a light green egg, but still quite infrequently.
Essentially there are two colors of egg shells Blue and White, and everything else is a coating of brown over top. If you pick up a warm, sticky, freshly-laid brown or green egg you can sometimes leave finger smudges in that coating... or see where your chicken tried to play football with it or eat it, and find a bunch of dried on scratch marks in the color...
@Kris5902 is correct. Pigment not only fades over the year but also the life of the hen. My Patsy was a Maran and they lay dark brown eggs Patsy's last eggs were pretty faded. So much that at first glance I almost mistook them for my orpington's.