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"The age-old argument over the best way to cook the perfect boiled egg could be a thing of the past thanks to a new hi-tech ink logo going on shells.
After cooking begins, an invisible, temperature-sensitive thermochromic print appears in black to indicate when an egg is soft, medium or hard-boiled."
http://news.bbc.co.uk/2/hi/uk_news/5226338.stm
After cooking begins, an invisible, temperature-sensitive thermochromic print appears in black to indicate when an egg is soft, medium or hard-boiled."
http://news.bbc.co.uk/2/hi/uk_news/5226338.stm
