Should I candle

[austincoopersilkiesies]

My silkie girl is broody on four eggs I did not give them to her she laid 3 eggs 1 is not hers should I candle and see iff they are fertile or not how shoulf I do this what should I look for it has been 4 days what should I use to candle.

 

[iluvsedward]

here: https://www.backyardchickens.com/t/...g-candling-pics-progression-though-incubation