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How To Make A Homemade Egg Candler Using Common Household Materials

A step-by-step guide to making your own egg candler
  1. BYC Support
    Candling Eggs

    Found an old can light in the garage. I bought a flourescent bulb for it, since they don't make much heat.​

    Cut a hole in cardboard so the eggs would set slightly in it. I made two of these, one for the smaller bantam eggs.​

    Here it is with an egg on it.​

    Here it is with an egg on it -- lit up!​

    How to candle
    To candle, darken the room. Eggs can be out of the incubator (or away from a broody hen) for up to 20-30 minutes before starting to cool down inside, so don't rush. You can GENTLY roll the egg on the candler to get the best view.

    Out of the 14 eggs in this batch, we removed nine by day 14 that were obviously not developing. There is a chance that a non-developing egg will explode in the 'bator, and that is messy and STINKY. It hasn't happened to me yet, though.

    I wouldn't candle after day 16 or 17. The eggs are mostly chick (black mass) and air sac by then anyway, and they should be left alone for the last few days before hatching (no turning from day 18-hatch).

    Pics from day 8 candling
    (click any pic to see a larger version)

    Store-bought non-fertile egg for comparison​

    Undefined, hard to tell if there's a chick developing​

    Spots like this may indicate bacterial contamination​

    Nice air sac developing,
    a good sign
    Watch this one hatch

    Nothing going on here!​

    This one had a faint ring, which is a sign of bacterial growth​

    This looks undefined, but ended up hatching out fine​

    Well-formed baby inside!​

    Another good one​

    good one​

    same one, slightly different angle​

    good one​

    something in there, for sure​
    You may want to visit our homemade incubators section or ask questions about incubating your eggs in our Incubating & Hatching Eggs Forum Section.

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  1. jafo
    going to check em tomorrow, day 8,,,,,,,,fingers crossed !
  2. Bducky
    Thanks for the chart!! I love the idea, but we are using our can light for the incubator i made. The chart is super helpful!
  3. babybuttonquail
  4. MyFrancesca
  5. chickenbusiness
    Just love it! It is priceless.
  6. TweetyNPetey
    But before i got the OvaScope, I was using this method, and it worked great!!
  7. TweetyNPetey
    I have a Brinsea OvaScope, and it works AMAZINGLY!!!! You can see so clear, it's almost as if you were looking right inside the egg!
  8. Coffeemama7
    Thank you for the wonderful pictures! My kids are now anxious to start candling all our eggs, even those in the fridge...this aught to be priceless!
  9. zara
    we also love this idea thanks
  10. wayne813
    just candled my eggs useing a soda can and lamp piece their doing real well thanks it works great

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