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español: Recogido del esmalte. Durante el enfriamiento la contracción del cuerpo cerámico es superior a la del vidriado. Es el opuesto a crazing.
English: The stresses that cause shivering are the opposite of those that cause crazing. It results in tiny slivers of glaze separating from the body. Often this is only noticed in ware several days after it has been fired when it has been sitting in one place long enough for a noticeable amount of glaze fragments to accumulate on the surface beneath it. This is a fault arising from a mismatch of the respective thermal expansions of the body and glaze and thus it may be evident immediately from the kiln or may only occur days or even weeks after firing. In extreme cases the fault may run not only through the glaze, but the body as well; these cracks often completely destroy the pot. Such a condition is occasionally referred to as dunting; however, this is incorrect, as the term refers specifically to a crack that results from thermal shock.
Shivering is caused by the clay body shrinking more during cooling than the glaze. If this stress is great enough it will cause flakes of glaze to crack and separate from the pot. This fault can be a major concern since the very sharp micro-flakes of glaze can be consumed (from the lip of a mug, for example), or they can get into food. As with crazing, glaze chemistry is normally the main culprit, glazes very low in alkalis and high in boron, lithia, magnesia and alumina can have very low thermal expansions and thus shiver. Bodies high in quartz grains can also be a cause.