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For other uses, see Candle (disambiguation).
Candling an egg

Candling is a method used in embryology to study the growth and development of an embryo inside an egg. The method uses a bright light source behind the egg to show details through the shell, and is so called because the original sources of light used were candles.[citation needed]

The technique of using light to examine eggs is used in the egg industry to assess the quality of edible eggs.[1]


  1. ^ "Candling Eggs". University of Illinois Extension. Retrieved 2012-06-06. Eggs are candled to determine the condition of the air cell, yolk, and white. Candling detects bloody whites, blood spots, or meat spots, and enables observation of germ development. Candling is done in a darkened room with the egg held before a light. The light penetrates the egg and makes it possible to observe the inside of the egg. Incubated eggs are candled to determine whether they are fertile and, if fertile, to check the growth and development of the embryo. 

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