It is possible i tried yesterday and had no luck I just can't see through, its the same with my dark egger too, i can only see through the white leghorn egg, i've tried with a led flashlight which works great with the white egg, for the others nothing, i tried using a 100w house bulb under a ceramic pot with a hole in the bottom, but it didn't light the eggs up, they will be a week gone tomorrow, the white egg definitely has a chick growing, as there's veins and a blob in the middle of them