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Ceramic tiles are preferred to textile samples as instrument controls because they

  • A.match the appearance of textile production closely
  • B.fluoresce strongly under ultraviolet light
  • C.are stable, uniform and easy to clean
  • D.are cheaper than any other available material

Answer: C

A drifting control cannot distinguish its own change from the instrument's. Stability is the primary requirement for anything used as a reference. Uniformity and cleanability matter too. Ceramic tiles satisfy all three requirements.

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