UV fluorescence is being used in some very interesting research fields, for exmple the Chelsea Technologies tryptophan sensor, which enables sewage monitoring Exciting Fluorescence Ultraviolet-induced visible fluorescence (UVIFL, also abbreviated as UVIVF) photography gives a result in the visible spectrum with primarily reds, blues and greens, and more. Reflected UV photography is the type of UV photography that produces monochrome results because they are in the non-visible spectrum so colour does not apply, and show a bulls-eye pattern on yellow dandelions. Reflected UV photography is a different ballgame altogether which requires bespoke uv-transmission optics, filters, lighting and ideally a converted camera - not an exercise for the faint hearted. Worth a peek, it's almost certainly unlike every other filter you've ever used Pink and mirrored on one side, yellow and mirrored on the other, military spec and it deliberately rattles in the filter. The Baader-U Venus Filter, currently the best filter to ensure that your excitation source (ie UV torch) emits only UV, so it doesn't produce those gharish purple overdoses (which is actually visible light spill). In fact UV UVIFL (UV-induced visible fluorescence photography) has never been more accessible than it is today, and combining this with extreme macro has the potential for some quite fascinating and unusual macro images. For ultraviolet-induced visible fluorescence photography, all you need is a 100% UV excitation source with no visible light spill and a UV barrier filter.
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