Discussion
A colourist would reject a predicted recipe that
Answer: A
Correct answer: uses a dye with inadequate fastness for the end use
Fastness is outside the colour calculation altogether - the software matches the shade and knows nothing about how it will survive light and laundering. A recipe that is correct colorimetrically and unfit for the end use is exactly the case the colourist exists to catch. A metamerism index of zero, by contrast, is an argument for the recipe rather than against it.
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