CT ask a stupid question? Never!!!
U.V. Flashlights
The problem though with U.V. seems to be one of getting the right wavelength, when comparing to what someone else is seeing.
It would be the equivalent of saying in the Visible Light Spectrum, that Stradivari's varnish is say perhaps a green color when using only the green visible light, having filtered out the rest.
This same thing happens in the U.V. part of the Spectrum when looking for the Salmon Pink colour, if you are not using the same wavelength as Sacconi, then you will not see the same color fluoresce.