What Is Crazing In Ceramics

We lakeside pottery know of cases where the pinging sounds of newly developed crazing lines go for many years.

What is crazing in ceramics. Sometimes items may have a couple of crazing lines on one side and not the other other times the crazing can look like a spider web and cover the entire item. Crazing is fine cracks in the porcelain s glaze. Crazing is a term used to reference fine cracks that can be found in the glaze of pottery or china. Crazing is a glaze defect of glazed pottery.

A craze pattern can develop immediately after removal from the kiln or years later. Stains can set in and make the crazing more visible and make the dishes look dirty or worn. They are not cracks in the actual piece of pottery but rather surface level cracks in the fired glazed of the piece. Crazing appears when ceramic is cooled and the glaze shrinks more than the clay to which it is rigidly attached.

Glaze crazing or glaze crackle is a network of lines or cracks in the fired glazed surface. What does crazing mean on china. It can also occur in pottery some plastics and composition materials such as the face of a composition doll that has not been properly stored. It is caused by a mismatch in the thermal expansions of glaze and body.

It happens when a glaze is under tension. They often have a spiderweb like appearance. The cause of crazing is the glaze being put under too much tension. Crazing translates to fine cracks in the glaze or surface layer of porcelain wares.