I’d say it’s a combination of the following:
1. The surface area of the egg has increased by the thickness of the chocolate, which is a good 5-10mm depending on the quality of the egg.
2. When remove the foil it crumples somewhat, and the subsequent tiny folds reduce the surface area of the foil.
Both of these put together probably only makes a small difference, but manufacturers work with small margins and don’t give you a great deal of additional foil.
If you smooth out the foil as best you can and carefully re-wrap the egg, I expect you’d get it pretty close to normal!
Latest Answers