Are porcelain dishes safe in the oven?

ANSWER:

Yes. Porcelain is a heat-resistant material, and a well-made cup or bowl shouldn't have problems in the microwave.

Take a look at the glaze on your bowl too: if it doesn't have any cracks, it shouldn't leach material from the glaze into your food when you heat it, and it might not have as much trouble with heat shock. A smooth, shiny ceramic surface with no cracks will be safer to use.

A lot of potters use this test for their wares: fill your bowl/cup/etc. with water, and put it in the microwave on high for 2 minutes. If the bowl heats up to the point where it's uncomfortable to hold, you probably don't want to use it in the microwave.