MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Frying an egg. Frying pan being used to cook an egg. While heating up, a black pattern is seen on the red patch (lower left) at the centre of the frying pan. When the patch has turned completely red (as here), this means that the correct cooking temperature has been reached.
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