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Alumina in a glaze acts chiefly to

  • A.form the whole glass network entirely on its own
  • B.colour the finished glaze a characteristic blue
  • C.raise the viscosity of the melt and stop it running
  • D.lower the temperature at which the glaze first melts

Answer: C

Without it the glaze would flow off vertical surfaces and pool at the foot. Too much makes the glaze stiff, matt and prone to crawling, so the quantity is a balance rather than a maximum. Alumina and silica are adjusted together rather than independently.

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