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English: A parting and contraction of the glaze on the surface of ceramic ware during drying or firing, resulting in unglazed areas bordered by coalesced glaze. (W).
Crawling is a glaze defect characterized by glaze beading up and leaving large, irregular areas of bare clay on the surface of a pot. This defect is caused by an error in glaze formulation that gives the glaze high enough surface tension to pull away from the surface of the clay.
Crawling is also thought to be caused when a dirty pot is glazed without being cleaned first. If a pot has built up a significant level of dust (which is a common occurrence in many potter's studios) and glaze is applied over that layer of dust it can cause problems during the firing. When the dust combusts during the firing, gas can build up under a viscous glaze and cause it to crawl away from the surface of the clay.
It should be noted that crawling is not always considered a defect. There are certain glazes, such as Shino, that are intentionally formulated to crawl in a more predictable and regular fashion as a form of surface decoration.
español: Defecto en el esmalte. Recogido del esmalte; Despegado del barniz; retiro; deslizamiento; descascarillado.