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I've candled over 6 dozen Marans eggs before, and none were too hard for me. I think the key is a powerful enough flashlight. The next, naturally, as a dark room.
What I do is cup my fist around the flashlight, then cradle the egg in on its side as if in a nest. Make sure no light escapes. With a powerful enough flashlight, you should see the beating heart from a white egg, the eyes from a green, blue, or brown egg, and nothing more than a large black mass from a dark Marans egg. That's all I need to see.
By day 5 and beyond, an infertile Marans egg will light up a solid red color, possibly with a faint dark blob (the yolk) floating around. A fertile egg will not light up at all, except on the pointed end. You should see a fine line where the black mass ends and the glowing red of the egg begins around there, too. That's a fertile one.
Beyond that, some eggs are light enough for me to see an even darker mass - the chick inside. But, in most occasions I just look for the black cloud that is the embryo.
I've candled over 6 dozen Marans eggs before, and none were too hard for me. I think the key is a powerful enough flashlight. The next, naturally, as a dark room.
What I do is cup my fist around the flashlight, then cradle the egg in on its side as if in a nest. Make sure no light escapes. With a powerful enough flashlight, you should see the beating heart from a white egg, the eyes from a green, blue, or brown egg, and nothing more than a large black mass from a dark Marans egg. That's all I need to see.

By day 5 and beyond, an infertile Marans egg will light up a solid red color, possibly with a faint dark blob (the yolk) floating around. A fertile egg will not light up at all, except on the pointed end. You should see a fine line where the black mass ends and the glowing red of the egg begins around there, too. That's a fertile one.
Beyond that, some eggs are light enough for me to see an even darker mass - the chick inside. But, in most occasions I just look for the black cloud that is the embryo.