Fewer than one egg in a hundred contains a red spot. This is particularly true for eggs sold in grocery stores, where most undergo a grading process called candling. A bright light is used to check the inside of the egg for imperfections, and eggs with noticeable spots are typically removed before packaging.
This sorting process is not about safety, but about appearance. Most shoppers prefer eggs that look clean and consistent, so stores simply avoid stocking eggs with visible spots.
Why Do These Spots Form?
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