this post was submitted on 06 Jul 2025
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Did you know egg shells are slightly permeable? Did you know it's good to crush egg shells up and feed them back to chickens to help provide the nutrients back to them for making eggs with strong shells? Chickens lacking proper nutrients will produce softer shells which can look weird and droopy as well as being less safe for a chick before hatching. Did you know the membrane is used in a plethora of products including beauty related items? Did you know there's still not a great way to quickly, easily, and cheaply separate the shell and membrane on a mass scale?
You too can read about eggs for 3 hours for no reason! My favourite part is remembering relatively nothing about the details the day after
Did you know the Japanese use a special machine to wash and check the eggs for structural integrity? That is why they eat raw eggs so much. It's very safe over there. Meanwhile in Germany, it is considered a good sign to have residual shit and feathers stuck to organic eggs. And this is where you start to deep dive into cultural differences between the continents.
Yes in europe and other places eggs generally arent washed before being sold. And often they aren't even sold in a refridgerator. this is not a problem, as the inside of the egg is protected in three ways: A cell-membrane around the white, a hard calcitic shell with proteins and breathing holes and a coating that makes the calcite less permeable for water and bacteria.
In the USA and Japan and other places, they think this is gross and industrially wash their eggs before they go to the consumer. This removes the outermost layer partially, allowing for ingress of bacteria, thus the eggs need to be refrigerated to remain safe.
A colleague of mine from Japan explained to me, that salmonella sit on the outside of the shell. When you crack the egg open, the salmonella can enter the egg white. By washing the eggs, you get rid of salmonella but make it more susceptible to other bacteria, which are usually less harmful.