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Illustration of comparison between API gravity of petroleum fluorescence emission color when excitation is by narrow-band (365 mm peak) ultraviolet light. The color of fluorescence may be controlled by multiple variables, so this should be used as a gr...
Illustration of comparison between API gravity of petroleum fluorescence emission color when excitation is by narrow-band (365 mm peak) ultraviolet light. The color of fluorescence may be controlled by multiple variables, so this should be used as a gross comparison only.

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