Make the egg empty by making a small hole on each end of the egg and then blow out the white and the yolk.
Then soak the shell in vinegar. The shell will dissolve in the acid and you are left with the membrane.
These photos come from Steve Spangler's page.
You can see more HERE
You can see in minute 2:37 that the membrane can collapse. The website recommends baby powder to keep the membrane dry.
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