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Crawling of a glaze, leaving bare patches of body, is usually caused by

  • A.poor wetting of a dusty or greasy surface
  • B.the glaze having been fired far too hot
  • C.an expansion mismatch with the body beneath
  • D.far too little alumina in the glaze recipe

Answer: A

Dust, oil from handling or a dried glaze layer that has cracked before firing all prevent the melt from wetting the body. Careful cleaning of biscuit ware before glazing is the usual prevention. The fault appears where the glaze has pulled away entirely.

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