How is candling used in the egg industry?

Chef's answer
Candling is the step during grading when the egg grader looks inside the egg (without breaking it) to judge quality. Long ago, this quality check was done by holding a candle behind an egg.
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Candling is the step during grading when the egg grader looks inside the egg (without breaking it) to judge quality. Long ago, this quality check was done by holding a candle behind an egg.
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