Blacklight poster
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A blacklight poster is a poster printed with inks which fluoresce under black light. The inks used contain phosphors which cause them to glow when exposed to the ultra violet light emitted from black lights.
In the United States, blacklight posters are commonly found in head shops and other retail outlets that sell items associated with counter culture. Blacklight posters commonly depict images of psychedelia, musicians/bands, and hippie culture.
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Black-light If you turn on a black light bulb in a dark room, what you can see from the bulb is a purplish glow. What you cannot see is the ultraviolet light that the bulb is also producing. Our eyes can see visible light in a spectrum ranging from red through orange, yellow, green, blue and violet. Above violet is ultraviolet light, which we cannot see. How Sunburns and Sun Tans Work discusses ultraviolet light and its effects on our skin. A black light bulb produces UVA light (as opposed to UVB light, which is much more harmful). (http://www.houstonfreeburgcollection.com/)
