It forms when a tiny blood vessel in the hen’s reproductive tract breaks during the egg formation process.
A small amount of blood then becomes trapped in the egg before the shell forms.
Sometimes the spot appears bright red. Other times it may look brown, dark red, or slightly gray as it ages.
Blood spots are a natural occurrence and are not a sign that the egg was fertilized.
How Common Are Blood Spots?
Blood spots are relatively uncommon in commercially sold eggs.
Modern egg-processing facilities use a method called candling, where eggs pass over bright lights that help inspectors identify and remove eggs with visible defects.
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