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Oven and Microwave Safety
Glazed earthenware is not normally recommended as an oven-safe material, however, it may be used in the microwave safely. There have been instances of earthenware pieces cracking in microwaves when a small food item has been placed on a large platter. In these instances, a large differential of temperature between the area that is in contact with food and the rest of the platter can be great enough to cause a fracture.