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Raising the quartz content of a body at the expense of feldspar will

  • A.make the body plastic without clay
  • B.raise the firing temperature required
  • C.lower the firing temperature required
  • D.have no effect on the firing at all

Answer: B

Less flux means less melt at a given temperature, so more heat is needed to reach the same degree of vitrification. The trade is against the risk of deformation, which more flux always increases. Refractoriness and ease of firing pull against each other.

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