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stoneware bowl gets very hot in microwave

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I have 4 bowls that I am sure are stoneware (safe in micro?). But they get extremely hot in the micro. They are colored red. Would that have any effect? Someone said that the paint might have lead. Would lead being in the paint affect me? And how can I find out if there is lead in the paint?

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  1. If you put some water in a bowl and put it in the microwave, the water should come out hot not the bowl. As to testing for lead, there are kits you can buy at many hardware stores.

    1. In another thread the OP talked about warming her plates in the microwave. After extensive discussion we learned that they were stoneware (or something like that). It sounded as though her stoneware reacted to the waves less than melamine, but more so than glass (or Corellware) - enough to warm up but not so much as to be dangerous.

      I don't recall anyone suggesting why stoneware was reacting.

      1. I have stoneware too, it gets hot in the microwave also. My other plates do not.

        1. http://ceramicstoday.com/articles/031...
          says that while metal in the glaze might produce arching, moisture in the ceramic might produce steam. I had a earthenware bowl get hot in a microwave because it was only glazed on the inside, and I had soaked it in water as per manufacturer's instructions.

          1. The bowl is going to heat up because whats in the bowl heats up.

            8 Replies
            1. re: Dave5440

              Yes, pretty much the case. The food heats up and yes, it will transfer to the vessel just like anything else you heat up. Put hot soup in a bowl and the bowl will get hot. I don't seem to find much difference between stoneware, china, and French porcelain - they all get hot to varying degrees.

              1. re: breadchick

                Though a reasonably observant individual should be able to distinguish between heat that is generated in the bowl itself from that conducted from the food. The fact that OP is commenting about the bowl getting hot, suggests that he has noted the difference. I mentioned another thread where the poster was warming bare stoneware plates in the microwave.

                1. re: paulj

                  how one one distinguish between the 2 , bowl hot contents hot,

                  1. re: Dave5440

                    The rim of a bowl should not get hotter than the contents.

                    1. re: paulj

                      The sharpest edge should get the hottest, which is the rim

                      1. re: paulj

                        Silly. If you stick plastic wrap over the bowl, the rim will certainly get hot. Anyone that spends major time at the office micro knows this. The poster didn't distinguish between vessel and contents. The issue is the red coating and if it's the source of the problem. (Perhaps the country of origin may be an clue.)

                      2. re: Dave5440

                        a Pyrex measuring cup is a classic example -- you can actually boil water in a Pyrex vessel in the microwave, but the handle will stay cool (as will the rim of the measuring cup...at least for a few minutes until the heat transfer warms it all up)

                        1. re: Dave5440

                          If i defrost something on my one set of stoneware plates, the plate gets very hot, while the food just gets defrosted.