why boiled egg shells can sometimes be easy to peel and other times stick and take chunks of egg with them

Question

why boiled egg shells can sometimes be easy to peel and other times stick and take chunks of egg with them

In: 203

Answer 1

There is a membrane between egg and shell. Put eggs in the cold water right after boil will allow the membrane detach from egg and becoming adhesive to the inner wall of shell. This is due to heat expansion and cold contraction.