Two schools of thought on this. I have heard from many breeders that they lay the darkest first and then fade through the cycle, then darken up when they start laying again, etc. My (limited) experience is that my pullets start out with a very respectable egg color and they are darkening somewhat as they get into the lay cycle (in winter!) Some lay 3-4 eggs a week, but I have one BBS that just gave me 7 eggs in 7 days (she knew I was going to set a hatch!). All those eggs are uniformly lovely speckled and dark enough that I would keep growout chicks from them. Good girl!The eggs may get darker later on, that is very dark for the first egg. Our Buff Orp first egg was much lighter tinted than they were later on!