2. If the colored glaze on the ceramics is inferior, putting such ceramics in the oven will also cause toxic spillover.
3. Frozen ceramics should not be put into microwave oven immediately. Experienced people all know that if you put the ceramics and pottery just taken out of the refrigerator into the microwave oven at once, they are likely to burst.
4. Ceramic bowls with metal edges are not suitable for microwave ovens. Metal products can't be put in the microwave oven, so if there are metal edges or metal patterns on the ceramic bowl, don't put it in the microwave oven.