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Pinholing in a fired glaze arises from

  • A.using far too much colouring oxide in it
  • B.gas escaping through the melt before it heals
  • C.the glaze having been applied too thinly overall
  • D.the body expanding rather more than the glaze

Answer: B

Bubbles from decomposing body constituents or from the glaze itself burst at the surface and the melt does not always close behind them. A slower approach to peak temperature and a short soak usually let the surface heal.

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