Blue, mould-like spots on egg shells

Discussion in 'Emergencies / Diseases / Injuries and Cures' started by Kchar, Mar 18, 2019.

  1. Kchar

    Kchar Hatching

    Mar 18, 2019
    Hi, I have had chickens for 1 year now, a and recently some of my eggs have been showing these bluish spots, almost like a mould. One of them was hardboiled and the spot grew drastically and turned very blue/green.
    I dont have a picture of the boiled one, but here are what the spots look like. These eggs are only a few days old, and sat on the counter after collecting. Is something wrong with the hens? Or is a coop issue?

    Attached Files:

    penny1960 likes this.
  2. micstrachan

    micstrachan Free Ranging

    Hmmm... I dunno, but honestly it would not phase me if they were my hens and J’m a pretty paranoid chicken keeper!
    Kchar likes this.
  3. Kchar

    Kchar Hatching

    Mar 18, 2019
    I'm just hoping its not a health or coop issue, and hopefully doesnt plauge all my eggs, making them unsellable
    penny1960 likes this.
  4. micstrachan

    micstrachan Free Ranging

    You might also post in the egg laying forum.
    penny1960 likes this.
  5. penny1960

    penny1960 Going back to La La Land

    Dec 29, 2015
    Mossyrock, WA
    Nothing wrong a bit of calcium build up on em is all it is
  6. rosemarythyme

    rosemarythyme Free Ranging

    Jul 3, 2016
    Pac NW
    My Coop
    One way to check if you're worried about mold: store a few eggs as you normally do, and try putting some in the fridge as well. Ideally use eggs from the same bird or same lay date. See if both groups show the blue spot, or if only the counter ones do.
    Brahma Chicken5000 likes this.
  7. staceyj

    staceyj Enabler

    Jan 1, 2017
    Coastal NC
    My Coop
    That does not look like calcium to me.

    Questions: do you wash your eggs or do you leave the “bloom” on them?

    Do you live in a dry or humid climate? Are they near a heating or ac vent?

    Do you collect eggs daily?
    Wyorp Rock likes this.
  8. Wyorp Rock

    Wyorp Rock Enabler

    Sep 20, 2015
    Southern N.C. Mountains
    Interesting that the spots seem to be "consistent" on location. Where and how are you storing the eggs? Do you re-use cartons?
    Do the spots scrape off or does that go all the way through the shell. Can you crack open an egg and get a photo of the inside of one?
    Photos of the hard boiled eggs?

    As for a hard boiled egg turning bluish/green on sometimes that does happen, it has to do with iron and sulfur.
    staceyj likes this.

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