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When a glaze sticks to the kiln shelf, causing chunks to be removed from the bottom when it's lifted. Prevent by using kiln wash on the shelves or by placing wadding under pieces.

Crystallization on the surface of the glaze making it appear dull. Prevent by controlling the firing cycle, particularly the cooling phase.

Refers to cracks that occur during cooling due to thermal shock. Prevent dunting by ensuring a controlled and slow cooling cycle, especially within the critical temperature range of 573°C–226°C (1063°F–440°F).

Occurs when the glaze layer detaches from the clay body due to poor application or adhesion. Prevent by ensuring a clean surface before glazing and applying the glaze evenly.

Caused by a glaze that is too compressed on the clay body, often from a mismatch in thermal contraction. To fix, adjust the glaze formula to better match the clay body's thermal contraction.

Glaze retreats from the surface during firing, leaving bare clay patches. This can be caused by oily or dirty bisqueware, too thick glaze application, or early glaze melting. Avoid by thoroughly cleaning bisqueware, controlling glaze thickness, and adjusting firing ramp speed.

Small holes or pits in the glaze surface. Caused by the bursting of gas bubbles during firing. To prevent, ensure thorough bisque firing, reduce glaze viscosity, and increase soaking time at peak temperature.

Physical separation in the clay body or glaze, often due to uneven drying or firing stresses. Prevent with even drying, proper compression during making, and controlled firing.

Deformation of a ceramic piece during firing due to uneven weight distribution or uneven heating. Prevent warping by ensuring even thickness and symmetrical design, and by placing ceramics properly in the kiln.

Bursts on the surface caused by particles of lime in the clay body expanding when heated. Use a well-purified clay and apply a wash layer before glazing to prevent this.

Incompatibility between glaze and clay body, leading to defects like crazing or shivering. Adjust the coefficient of thermal expansion of the glaze to match the clay body to prevent issues.

Cracks with a distinctive 'S' shape formed in the bottom of thrown pots. Prevent by compressing the clay properly during wheel throwing and ensuring even thickness.

Foreign materials in the clay body create defects. Prevent by sieving the clay slip and ensuring a clean working environment.

Small pieces of clay body or glaze pop off during firing, often due to contamination or overly rapid heating. Prevent by cleaning greenware properly and ensuring a gradual firing ramp.

Occurs when glaze retracts from the ceramic surface creating bare patches. Improve by cleaning the surface prior to glazing, using the correct glaze application, and avoid too-thick glaze layers.

Caused by the glaze being under too much tension. This can be prevented by matching the thermal expansion of the glaze to the body, or by reformulating the glaze to have a closer thermal expansion fit to the clay body.

Fine network of cracks on the surface resembling quarry tiles, caused by incompatibility between glaze and body. Refine glaze composition to match the clay's thermal expansion to prevent.

Typically caused by over-firing the clay body or by gases becoming trapped in the clay during firing. To prevent bloating, ensure proper firing temperatures and soak times, and use a clay body with low organic content.

Formed by gas bubbles that burst on the glaze surface during firing. Prevent by firing at a high enough temperature to allow gases to escape before the glaze matures, and by using a slow cooling cycle.