Discussion
Plotting the reflectance curves of a pair on the same axes is useful because
Answer: B
Correct answer: crossovers reveal metamerism immediately to the eye
Two curves that cross several times while enclosing roughly equal areas are the visual signature of a metameric pair, and it is apparent at a glance in a way no single number conveys. The plot shows where the difference lies in wavelength, which is what suggests which colourant is responsible.
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