Egg candling, to detect infertile eggs.
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Previously:
https://www.homemadetools.net/forum/...555#post143096
https://www.homemadetools.net/forum/...925#post129459
https://www.homemadetools.net/forum/...262#post169209
https://www.homemadetools.net/forum/...397#post146629
https://www.homemadetools.net/forum/...469#post127725
https://www.homemadetools.net/forum/...113#post125901