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Dyes are standardised on delivery in order to

  • A.correct for lot to lot variation
  • B.improve their solubility in water
  • C.reduce their cost per kilogram
  • D.extend their useful shelf life

Answer: A

A commercial dye can vary by several per cent between deliveries, which shows directly in the shade. Standardising against a reference lot lets the same recipe be used from one delivery to the next. Pale shades reveal the difference first.

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