I wouldn't say Marans eggs are thicker. In general, they appear to be the same thickness as all of my other breeds' eggs. I would agree that the pigment on the outside is the difference, and in my opinion, it is this pigment that makes the eggs evaporate less during incubation. When eggs don't...
Ah- here we go- I sent this to a customer back when I had my French Cuckoo Marans.
I just get past the color, then I mist the egg with Betadine water mixed to be like a dark iced tea- this replaces the bloom that just got sanded off...
Pop them into the incubator and there you have it...
I'm going to throw a can of worms out in the middle of this conversation...
I SAND some of the coloring off of mine (only when shipped) and add NO water until day 19, then I go to 60 or 65% for the hatch.
I have consistently found that when I do this I get great hatches. When I don't, the egg...