Microwave oven has sparkings on a mug!

hi, what causes the sparks on a mc oven, when the mug is made of dried mud?
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More about microwave oven sparkings
  1. there must be some linings of gold ribbons on the mug. usually made to keep it intact. they are not aaaaaa.compatible with it.
  2. definitely some metal in whatever mud was used to make it - microwaves be not happy with most metals... :non:
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