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What about UV-LEDs? Mount them under the bottle or wrap them and put them into the liquid. Maybe add a little milk.
Oh, did I say milk? There is a saying that Hitchcock had dropped a flashlight into a glass of milk in a movie to enlighten it...
There is also an indicator color called flourescein shining in a bright green. Unfortunately it is excited by blue light. But if you just but a little bit of it into water and add some KaOH or NaOH you can place the bottle into a dark corner of your room and it will look pretty nice. No need for black light.
virtuPIC
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Airspace V - international hangar flying!
http://www.airspace-v.com/ggadgets for tools & toys
This kills the special effect of glasses / bottles containing liquid shining in the dark...
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Airspace V - international hangar flying!
http://www.airspace-v.com/ggadgets for tools & toys
its so annoyingly pointless its untrue