Okay good. They lay considerably lighter than a Marans - just a regular cream to brown. If you are wanting something rare with dark eggs, then Penedesencas would be a better choice. The Langshans are very impressive looking birds, though.
I just want to throw it out there that if you are wanting to get Langshans for purple eggs, they are very rare even in the professional breeder ring (I breed SQ bantam Langshans). It is much like hoping for Marans eggs that are nearly black. The breed standard for Langshans lists the egg as...