Why is my Hen laying this color egg?

[Shipgirl]

I have a variety of hens laying a variety of colors. Sometimes, they look speckled or mottled, and it is the medium to dark brown ones that will once in awhile have a discoloration effect. As I gently wash & crate eggs for market, most times those few speckled or color variations will come right off. I really don't know if it might be during the last coat of egg shell formation, or if it might be related to the hen's bloom. Yesterday morning, I got a really interesting looking egg...like my hen was trying to copy a marble design. Like yours, my hens all eat a well balanced diet & are happy & healthy, so it is a mystery to me, but as long as the hens are healthy & the eggs are awesome, I'm not worried about it. Here are a few pics. You see the 1 marble looking egg I'm holding?

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Thats pretty cool. This hen lays the same every time since she started laying. Doesn’t wash off or anything. I hatched her chick, which is 9 weeks old now to see if she will lay similarly.