If your black light tube was made from clear Mercury gas gives off green, blue, and UV light. For example, neon gives off strong red/orange, which gives neon lamps their bright color. Rainbow of colors coming from the white flourescent powder will make the blue and purple strips nearly impossible to see.) Other gasses give off Point an inexpensive classroom spectroscope at the flourescent lights in the ceiling, you will see the green frequency emission as a thin green stripe (although the Mercury gives off green, blue, violet, and invisible ultraviolet (UV) frequencies. The gas gives off various frequencies of light, and humans usually see these as colors. When high voltage is applied across the ends of the tube, a big, silent, fuzzy spark jumps through the low pressure gas inside, and this makes the gas
If you could find a flourescent tube made fromĬlear glass with no white coating, you'd be able to see some tiny droplets of mercury rolling around inside. The difference is that "UV" lights lack the white phosphor coating, and they are made with dark blue glass.įlourescent tubes contain a near vacuum with a little mercury vapor. Posted By: William Beaty, Engineer / Interactive exhibit designerĪ "black light" or Ultraviolet lamp is almost the same as the flourescent lights used in most classrooms. Re: What gases are in a black light bulb and how does it work?
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