Edited by DesPa, 16 November 2005 - 09:18 PM.
Using "black" light
Posted 16 November 2005 - 09:15 PM
Posted 16 November 2005 - 10:05 PM
To get certain colors and whites to glow (like teeth), you need to use real UV light. Common blacklight tubes are too dim for moviemaking purposes unless they are really close to the object and you use a bank of tubes. Usually a movie will rent powerful UV lamps from a company called "Wildfire".
I did a blacklight scene years ago for a student film using 500 ASA film shot wide-open on a Super-Speed lens, and some ordinary fluorescent blacklight tubes bunched together and held really close to the actors. I augmented this with some normal lights gelled super blue (like with Congo Blue) to get some exposure on the faces. But you don't want that fake blacklight to overpower the real blacklight, so keep the super-blue lighting really dim.
Edited by David Mullen, 16 November 2005 - 10:06 PM.
Posted 17 November 2005 - 02:17 AM
Posted 17 November 2005 - 11:25 AM
I have seen fluorescent effects under HMI light with congo blue filtration, probably because the HMIs put out an enormous amount of longwave UV anyway, and all the gel's doing is making the effect visible by losing much of the visible glare of the lamp.
There are tons of companies other than Wildfire who make UV cannon, although most of them are mercury vapour lamps which will not be flicker free.
Posted 28 November 2005 - 08:04 AM
Posted 13 November 2009 - 05:39 PM
So I finally, ended up using this black light bulbs for Kinos. I'm not exactly sure about the name, but they worked like a charm. They're skinnier than a regular Kino Bulb and they are true UV. The shining teeth effect was perfect. I also tested the rosco congo blue filter but that didn't do the trick. I guess that would fake it if you were to shoot a club scene or something were you're mixing light sources, I was doing product shot so I needed the real thing, I did use some Dedo's with Full CTB + Congo Blue (I know, almost no output) but just enough for some edge lights. Thanks everybody for your suggestions.
Do you know what they were called?
Posted 13 November 2009 - 05:51 PM
.... although most of them are mercury vapour lamps which will not be flicker free.
Perhaps you could use long-decay paints to smooth out the flicker? Certainly worth a test.