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The technique you’re looking for is called Candling. I used to do this when I made the flu vaccine.
Its basically a light with a rubber cup on it to focus the light into the egg. Works really well.
Here’s a random website that seems to have good info:https://www.thehappychickencoop.com/the-complete-beginners-guide-to-egg-candling/
Candling will not tell you if the egg is fertilized until Day 4 or so, when the veins start to develop.
If you care, shouldn’t you check before boiling them?
I usually don’t care but that time while boiling, the egg exploded something that looked like feather , so I had this question I asked , but when I cut it I found it’s a normal egg
