Go on, lick your fingers. See if you can produce some glow in the dark liquid
I suspect it has a laxative effect actually, explosive results that can be see in the light and the dark, doesn't bear thinking about. It would make tracking animals at night easier though, Otter spraint would never be the same again. Perhaps it would encourage dog owners on the last walk of the evening to pick up after their pooches more, or at least you could clearly see where you had trailed it!
A well known trick of hardcore Squaddies of course is to drink the contents of a supposedly non-toxic activated Cyalume and then write the RSM' name on the, um, parade ground, snow or no snow!
The disadvantage is that you might get shot by a sniper for taking the p....... I have oft heard it said that the sign of a real marksman is someone who can tactically wash the bowl at night without being heard to splash, a long developed skill that led to the phrase 'Silence is Golden'! Markswomen still haven't cracked this one it seems or at least I haven't heard a successful demonstration.