Dry fire

During the drying process, the clay acquires the same humidity level as the air in the room. Therefore, your piece might not be completely dry. To eliminate that last bit of moisture, you fire your piece at a low temperature in a ceramic kiln before the bisque firing. The goal is to completely evaporate the moisture in the clay, so that the object is sturdy enough to withstand the high temperatures of the firing process without cracking or deforming. This process is called the dry firing. It is often integrated into the bisque firing.