A movie making the contents of the egg visible without breaking the shell
Calcium in egg shell seems to melt by soaking in vinegar. You can see the yolk moving in it.
Playback is from the following. Just putting it in vinegar makes the scuffing puffy.
Color X-Ray of an Egg Video
The reasons why calcium dissolves with vinegar are explained on the question page of Malkan vinegar.
Why does calcium get into vinegar?
It seems that the membrane of Puyo Pu which is the last remaining bubbles occurring in the middle due to carbon dioxide bubbles is the eggshell membrane of the egg.
Also, as health foods, there seems to be a dish called eggs egg, which pickles eggs of crow's chicken in vinegar in the same way as animation.
How to make an egg egg
in Video, Posted by darkhorse_log