One type of lamp has a violet filter material, either on the bulb or in a separate glass filter in the lamp housing, which blocks most visible Black light and allows through UV, so the lamp has a dim violet glow when operating.
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In medicine, forensics, and some other scientific fields, such a Black light source is referred to as a Wood's lamp, named after Robert Williams Wood, who invented the original Wood's glass UV filters.
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Fluorescent black light tubes are typically made in the same fashion as normal fluorescent tubes except that a phosphor that emits UVA light instead of visible white light is used.
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UVA Black light has been shown to cause DNA damage, but not directly, like UVB and UVC.
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Ultraviolet radiation is invisible to the human eye, but illuminating certain materials with UV radiation causes the emission of visible Black light, causing these substances to glow with various colors.
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Wood's lamp is a diagnostic tool used in dermatology by which ultraviolet Black light is shone onto the skin of the patient; a technician then observes any subsequent fluorescence.
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Black light is commonly used to authenticate oil paintings, antiques and banknotes.
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Black light can be used to see animal excreta such as urine and vomit that is not always visible to the naked eye.
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Fluorescing fluids are applied to metal structures and illuminated with a black light which allows cracks and other weaknesses in the material to be easily detected.
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The use of such materials, often in the form of tiles viewed in a sensory room under UV Black light, is common in the United Kingdom for the education of students with profound and multiple learning difficulties.
| FactSnippet No. 978,830 |