The Golden Egg

As much as I'd love to have the famous goose which lays the golden egg, we haven't been able to locate her yet. We did however, manage to create the golden egg ... or at least one that shines in the sunlight and looks magical!
The Golden Egg

The process if very simple and proved to be a great science activity for both the boys and I. The end results were surprising for us all.

The process

Place the egg in vinegar
Simply place an egg in a glass or a glass jar and cover with vinegar. The glass is great as it allows the process to be easily observed.

We used white vinegar because that is what we had. It would be interesting to see if the results were different with brown vinegar. I liked the white vinegar as it allowed us to see the egg clearly.

After the vinegar (acetic acid) comes in contact with the egg (calcuim carbonate), a chemical reaction occurs in which a gas (carbon dioxide) is released. This can be clearly seen as the carbon dioxide forms bubbles all over the egg.

We left our egg in the vinegar for a couple of days (maybe even 3) - until the egg felt soft and bouncy when gently prodded. I realise that if I were a proper scientist, I would have had the exact time documented. Hmmm ... the secret's now out ... I'm "winging" it here!!!

At this point, I should warn you that the egg is very soft. We actually had to start this activity over 3 times due to curious prodding fingers and a cracked egg shell. What can I say? It was all a learning experience. :o This is also evidence that things don't always go as planned in our home! However, it didn't really matter as we had the time, the eggs and the vinegar!

The results

The egg felt rubbery
It was absolutely fascinating to touch the egg once we brought it out of the vinegar. A quick wash removed any brownish material remaining on the egg.

The egg in vinegar swelled
Amazingly, it had swollen so that it was much larger than when we started. We compared a normal egg (right) with the vinegar-egg (left).

One of our vinegar-eggs (from an earlier experiment in which the egg broke before I could get the camera), looked so transparent you could actually see the yolk inside it.

When we took the egg outside into the sunshine, it literally seemed to glow.
The remains of the eggshell felt rubbery

Once the egg broke, what was left of the eggshell could be picked up and felt sort of rubbery.

The yolk of the egg such felt rubbery
I thought that was the end of the experiment until Daniel picked up the egg yolk. He was amazed by the plastic-like texture of it. Just goes to prove that there's always something new to discover - especially when you have curious children around.

Making new discoveries
I loved this activity - the simplicity of it as well as the process and the end result. We'll be doing it again but this time trying it with a hard-boiled egg to see what sort of results that produces.

Extension Activities

Our thanks to Bellinda who has since introduced us to this post on

They have a couple more suggestions to do with these eggs - e.g., letting them dry/ putting them in water. We'll have to try these ideas as well.

Who knew that there could be so much you could do with the humble egg and a bit of vinegar!

Now in regards to the goose that lays the golden eggs, if anyone does discover it, please feel free to send it in our direction. We'll happily build it a little home in the backyard and share any golden eggs it lays!

If you do this science activity, we'd love to hear how you go. Feel free to leave a comment on this post or on our facebook page.

You may also like these activities:

Homemade Playdough Circuits
Homemade Playdough Circuits
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Return to the Articles List for other children's learning activities or children's book reviews.

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