The ultraviolet frequency of black light is higher than the violet colour of the spectrum that the human eye can distinguish. Beyond the violet colour on a spectrum are colours that humans can't see. These colours are known as ultraviolet colours. Black light produces ultraviolet light. When things glow in the dark, they are coated with a substance such as a phosphor, which converts energy in black light to visible light.
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Posters that glow under black light are priced at approximately £6 as of November 2010. Blacklight.com supplies a "Yes We Can" black light poster of President Barack Obama, the Joker from the "Dark Knight" movie and Lil Wayne. The manufacturers also apply luminescent paints to paper and canvas materials to produce cloth wall hangings.
Wildfire claims that its luminescent paint has the highest pigment concentration of any ultraviolet paint. Set designers use luminescent paint, and crafters can apply it to paper, plaster, metal, canvas, plastic, wood, masonry and fabric. Certain make-up, inks, glow-in-the-dark body paint and temporary hair dye also glow under black light.
Some room decor glows in black light. WildfireFx.com supplies 60-watt coloured fluorescent bulbs for its SpectraMaster Fluorescent Color Changers. The fluorescent bulbs are available in red, blue and green. The colour changers boost the bulbs' wattage to 120 with 11,000 hours of continuous use. Other party supplies that glow in black light include tape, roping, arts and crafts, balloons, barware, bubbles, and candles. Temporary tattoos that glow in black light stand out at a party.
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