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Black Light
Home » Lighting & Fans » Specialty Light Bulbs » Black LightBlack light bulbs are common at amusement parks, science museums, and at Halloween. Black light makes things that are white or fluorescent seem to glow in the dark. This light is sometimes used at amusement parks, as they will sometimes use hand stamps that are invisible unless they are viewed under black light. A Black light bulb produces black light, but the light seems purple when viewed in a dark room. Unseen is the ultraviolet light that is also being produced by the Black light bulb. Human eyes can see light in a spectrum that ranges from red to violet. But above violet is ultraviolet light, which is unseen by the human eye. Phosphors are what make things glow under black light.
A phosphor is a substance that puts out visible light in response to radiation, meaning that a phosphor converts the energy in radiation to visible light. Fluorescent paint contains a phosphor that absorbs radiation and re-emits it into visible light, making it look much brighter than regular colored paint. Liquid laundry detergent also contains a phosphor, and this is what makes your white socks and t-shirts glow under Black light.
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