Marks on one of my chicken's eggs

[yolka doodle]

Hi all i had trouble downloading my pictures i hope you can see the marks clearly. When my hen lays on the coop floor the eggs have like a water mark on them, any clues as to what it is? thank you

 

[howfunkyisurchicken]

It looks like a little excess calcium to me, and its normal
I get eggs that look like this, sometimes they even have bumps (looks like warts).
Nikki

 

[chfite]

The transition in color is similar to what I often see on our eggs. I think it evens out with exposure to light. We ignore it.

Chris

 

[yolka doodle]

Hi, thank you for your replies, i was just worried in case she was lacking in something. you have been very helpful