Egg that tells you when it's ready to be beheaded

In the quest for the perfect boiled egg, it definitely counts as a breakthrough.



Food scientists have developed an invisible-ink logo which appears in black on the shell when the egg is done. Soft, medium or hard-boiled eggs can all be produced with the same system, which is due in stores within the next few months.

A spokesman for Lion Quality Eggs, whose logo is an assurance of food safety, said the development followed a flood of queries from customers who did not know how to boil an egg properly.