It would be a good idea to candle these eggs since they weren't marked from the beginning.
If you do decide to candle, use the brightest flashlight you have, cut a piece of cardboard in a circle the same size as the flashlight bulb end. Cut a small hole in the center of the round piece of cardboard. It should look like a doughnut. Tape your cardboard doughnut around the flashlight end where the light shines through. Take the eggs into a very dark room and shine the light through the large end of each egg.
It takes some practice to understand what you're looking for and what you're looking at.
If you do decide to candle, use the brightest flashlight you have, cut a piece of cardboard in a circle the same size as the flashlight bulb end. Cut a small hole in the center of the round piece of cardboard. It should look like a doughnut. Tape your cardboard doughnut around the flashlight end where the light shines through. Take the eggs into a very dark room and shine the light through the large end of each egg.
It takes some practice to understand what you're looking for and what you're looking at.
