A condition produced in certain porcelain, fine earthenware, or glass, in which the glaze or enamel appears to be cracked in all directions, making a sort of reticulated surface; as, Chinese crackle; Bohemian crackle.
1.One of the three sounds rice crispies make when you add milk [ snap and pop are the other two sounds ] 2. When glaze melts, it is a molten liquid covering the piece. As it cools and turns back to a solid, it shrinks. It does not always fit the clay body. Since it is not elastic and flexible; it cracks. When a glaze or colorant of another color is rubbed into the cracks, the cracks are more visable. Sometimes, the oxygen in the kiln is reduced during firing. When the glaze shrinks; black carbon fills the cracks, leaving the cracks visable. Craclke glazes are specially formulated to do this on purpose. see crazing
A more or less controlled crazing of glaze for decorative effect: oxides are sometimes rubbed in to enhance the pattern.