Discussion
Consider the following statements about fluorescent whitening agents.
1. They require ultraviolet content in the illuminating source to work.
2. They increase the apparent reflectance in the blue region.
3. They raise the luminance factor by absorbing visible yellow light.
Answer: A
A whitener needs ultraviolet excitation and adds blue emission, so the first two hold. The third describes blueing, which subtracts yellow light and therefore lowers rather than raises the luminance factor of the sample.
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