Discussion
The blue light emitted by a brightener compensates for
Answer: D
Correct answer: residual yellowness of the substrate
A bleached fabric still absorbs a little at the blue end and therefore looks faintly yellow. A brightener absorbs invisible ultraviolet and re-emits it as visible blue fluorescence, and that added blue cancels the residual yellow to the eye. The fabric reflects more visible light than falls on it in the visible range, which is why it appears whiter than white rather than merely clean.
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