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Luminous ink under ultraviolet light Fluorescent paintings lit by black light. Black light paint or black light fluorescent paint is luminous paint that glows under a black light. It is based on pigments that respond to light in the ultraviolet segment of the electromagnetic spectrum. The paint may or may not be colorful under ordinary light.
When the black light falls upon UV-visible ink, it makes the ink fluoresce so that it emits visible light, making the message readable by human eyes. [4] In some cases, people can also use photocopiers to develop UV-visible ink messages, because the scanning head of the machine emits UV light. [5]
Human eyes perceive this light as the unusual 'glow' of fluorescence. The painted surface also reflects any ordinary visible light striking it, which tends to wash out the dim fluorescent glow. So viewing fluorescent paint requires a longwave UV light which does not emit much visible light. This is called a black light. It has a dark blue ...
[18] [19] UV ink can alternatively be used to highlight tattoos made with regular ink: normal ink is used to create a tattoo, allowed to heal, and then highlighted with UV inks. [18] UV inks are made with distilled water and cannot be mixed with regular inks, which are usually based on alcohol. [18] Additionally their consistency is thinner. [1]
Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means, such as heat or ultraviolet light.
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