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The colourant database must be updated when

  • A.the software version is updated by the supplier concerned
  • B.a new observer is appointed to the laboratory
  • C.the price of the colourant changes
  • D.a new dye lot with different strength is received

Answer: D

Strength variation between lots changes the relationship between concentration and colour. Price changes affect the ranking but not the prediction. Strength variation does affect the prediction. Price affects only the ranking.

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