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Opacity in a glaze is most commonly produced by

  • A.increasing the silica content quite substantially
  • B.firing the glaze at a very much lower temperature
  • C.applying the glaze in an extremely thin layer
  • D.adding zircon or tin oxide that stays undissolved

Answer: D

Fine particles suspended in the glass scatter light and hide the body beneath. Zircon has largely replaced tin on grounds of cost, though tin gives a softer white that some producers still prefer. Opacifier content is set against both cost and the whiteness wanted.

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