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Why would a boiled egg have a white square embossed on the outside?

At breakfast one day, my 4-year-old son was peeling his boiled egg when he noticed something unusual. On the side of the egg was an almost perfect white square with sides about 1 centimetre long. This was enclosed in an oval patch of yellow matter (see photo, left).

Although the yellow patch looked like egg yolk, the egg appeared normal when I cut it in half, and I could not see any connection between the egg yolk in the centre and the yellow patch on the outside.

Does anyone know how this formation was created?

Johan Forsberg, Linköping, Sweden

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Last edited on: 2009-10-07 15:59:53

Categories: Domestic Science, Animals.

Tags: animals, planetearth, domesticscience, egg.

 

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Henry says:
I don't know exactly how this would cause the shape on the inside of the egg, but perhaps the square corresponds to the shape of the holes in the floor of the chicken's cage. Was the egg free range or battery farmed?
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posted on 2008-12-10 22:18:00 | Report abuse


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greatone says:
it was formed byy (drum roll) ... a chicken! I'm done for today, I'll be back on ns tomorrow if you need me.
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posted on 2008-12-12 01:37:00 | Report abuse


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teaghee says:
One would suggest that there has been an outside influence involved in this. A distinct possibility would be that the egg was laid directly onto a chicken wire covered heat source. The force although not sufficient to break the shell, could have been enough to suggest a leak from the yolk sac (or secondary yolk sac closer to the egg wall). As the egg nestled on the wire above the heat source, there was sufficient heat energy to disaggregate the protein structure of the albumen, and in effect formed a partly "boiled egg". Of course, the wire constraint would have prevented the heat from affecting the total lower area of the egg. Thus the phenomonon, as in the picture, occurred.
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posted on 2008-12-12 10:23:00 | Report abuse


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Anonymous says:
This was the work of the famous Greek hen Poulades to prove that it is possible to square the oval.
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posted on 2008-12-13 12:10:00 | Report abuse


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Norman says:
The hypotheses proposed so far imply that the effect would be quite common. Since it is not common, I don't think they can be correct.
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posted on 2008-12-15 16:32:00 | Report abuse


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