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However, in-shell pasteurized eggs may be used safely without cooking.
Candling is the process of using light to help determine the quality of an egg.
To be safe, eggs must be safely handled, promptly refrigerated, and thoroughly cooked. "Eggs existed long before chickens," according to by Harold Mc Gee.
"The first eggs were released, fertilized, and hatched in the ocean.
Manual scanning techniques involve conveying the eggs over a light source where the defects become visible and the defective eggs are segregated.
Hand candling-holding a shell egg directly in front of a light source—is done to spot check and determine accuracy in grading.