Discussion
Colour difference between a sample and a standard is normally expressed as
Answer: C
Correct answer: a single number from a difference formula
A spectrophotometer measures both samples, the readings are converted to a uniform colour space, and a difference formula - CIELAB, CMC or CIEDE2000 - reduces the three-dimensional separation to one number. Compressing colour to a single figure is what makes an objective pass or fail decision possible, and it is why the formula used must be stated with the number.
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