I got 9 eggs today, from 9 layers, but I haven't seen a shiny dark brown egg for about 5 days now. My lone Cuckoo Marans has been laying about 4 a week, which are 6-7 on the darkness scale. She lays the biggest egg of the 9, and there was an egg today that was the right size, but had NO "varnish" on it. It had a couple of dark specks, but was otherwise creamy brown like my Wyandottes. I know they can lighten with time, but can the Marans varnish turn off? Maybe the cold?