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In this exhibit, half
of the FLUORESCENT TUBE is clear, while the other half is coated
with white phosphor. When you look at the different parts of the
tube with a spectroscope, the clear end shows specific spectral
colors. The coated end has these colors plus an additional continuous
spectrum of colors due to the phosphors. The mercury gas in a fluorescent
tube produces strong ultraviolet light, which the phosphor coating
absorbs and re-emits in the continuous spectrum. It is this process
which is called fluorescence.
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