Revolutionary 'self-timing' eggs designed to overcome the perennial problem of how to avoid runny whites and overcooked yolks will appear on supermarket shelves in the coming months.
The eggs are marked with logos in 'thermochromic' invisible ink, which turns dark when it reaches a certain temperature.
Inks have been created to appear after three minutes to indicate a soft-boiled egg, after four minutes for medium and after seven minutes for a hard-boiled egg.
Shoppers will be able to buy the eggs of their choice in cartons marked 'soft', 'medium' or 'hard'.
Monday, July 31, 2006
From the Telegraph:
at 9:09 am