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Three of the following are controllable sources of shade variation. Which is the odd one out?

  • A.dye strength between deliveries
  • B.the preparation of the substrate
  • C.the colour vision of the operator
  • D.water hardness in the supply

Answer: C

Operator vision is a reason to measure rather than judge by eye, but it is not a process variable that can be controlled. The other three are all held steady by ordinary quality procedures. Instrumental measurement removes the observer entirely.

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