That's all I had to do, but it can get much more involved. U.V. Spectroscopy, being the basis for much of the Chromatography business can be more precise with indicators and photo luminescence.
Basically that is all I had to do except I had to use a microscope to even see what I was looking for. I would presume that given the broad spectrum of 'excited' conditions, one could see many different colors in one sample. Each individual and differing shaded light in a field of interest with the aid of some polarizing filters or something to diffract the images.
Andy