Post #9176 by Tiki King on Wed, Sep 25, 2002 10:01 AM

Crazing is basically cracks in the glaze. it is often, but not always, a sign of age. It can occur in new mugs if the glaze does not "fit" the clay. Ceramic clay is like stone, and glaze is more like glass. These can have different expansion rates, and if exposed to sudden tempeture changes, crazing can occur. If it is in an old piece, well, that is the way it goes. If it is in a "new" mug, that is bad.