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Candling eggs is the process of viewing the inner contents of a fertilized egg by placing it in front of a bright light (most people use a flashlight or a specific candling device). The reason its called “candling” is that they used to use a…...candle. Shocker, eh? Candling is used to estimate the age of an egg, as well as whether it’s been fertilized or if it’s going to rot. When you’re shining the light onto the egg, if you can barely see the yolk, you’ve got yourself a fresh egg, but if you’re seeing the yolk move around the egg freely and clearly, you’ve probably got an egg that’s older.Read less