This is a pretty standard, light brown egg that many, many of our breeds lay, including Cochins, Rocks, Buckeyes, and Jersey Giants.
To name but a few.
Some see this as "pink"....oldsters do not.
It is called a light brown egg.
And very nice ones, to boot !
That's pretty much what I was getting at. Nothing special about their egg color. There's an old misunderstanding about the Langshan and people want to breed it for a pin/plum/purple cast depending on who you talk to, and that's just a mistake and could very easily destroy the breed if people start trying to breed for some weird egg color rather than the other aspects of the breed.