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How to blow the shell off a hard boiled egg
Remove a little bit of shell from each end of the egg.
It helps to gently hit the ends against a hard surface to create small cracks. Do this to an area about the size of a dime on the smaller end (18 mm diameter) and about the size of a nickel on the larger end (21 mm diameter).
Roll the egg between your hands or on a hard surface to loosen the shell from the egg. This should produce small cracks throughout the shell.