From Francis Norton
Feedback’s insinuation regarding the label on a mug is completely unjustified (11 September). Some utensils have a chemical composition which means they heat up faster in a microwave than the food inside them. Many is the time I have put a mug of coffee in the microwave, only to find that the mug is too hot to touch and the contents lukewarm.
It is a perfectly sensible warning.
London, UK
