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Blacklight paint. 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. Black light paint should not be confused with phosphorescent ...
Blacklight. Blacklight fluorescent tubes. The violet glow of a blacklight is not the UV light itself, but visible light that escapes being filtered out by the filter material in the glass envelope. A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave (UV-A) ultraviolet light and very little ...
These lamps emit ultraviolet light with two peaks in the UVC band at 253.7 nm and 185 nm due to the mercury within the lamp, as well as some visible light. From 85% to 90% of the UV produced by these lamps is at 253.7 nm, whereas only 5–10% is at 185 nm. [36] The fused quartz tube passes the 253.7 nm radiation but blocks the 185 nm wavelength.
Invisible ink. A coded letter from Benedict Arnold, originally written in invisible ink. Handwriting by Peggy Shippen Arnold is interspersed with coded communication in Arnold's hand. 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 ...
Blacklight poster. Pictures with messages visible under blacklight. A blacklight poster or black light poster is a poster printed with inks which fluoresce under a blacklight. [1] The inks used contain phosphors which cause them to glow when exposed to ultraviolet light emitted from blacklights. [2][3]
UV tattoos or blacklight tattoos are tattoos made with dyes that fluoresce visibly under a blacklight or other ultraviolet (UV) light source. Depending upon the tattoo ink used, an ultraviolet tattoo can be nearly invisible when illuminated only by light within the visible spectrum. Blacklight tattoo ink does not glow in the dark, but reacts to ...
In general, philatelic fakes and forgeries are labels that look like postage stamps but have been produced to deceive or defraud. Learning to identify these can be a challenging branch of philately. To a large extent the definitions below are consistent with those given in the introduction to various recent editions of the Scott Standard ...
The first theme is using legendary luminous gems to illuminate buildings, for navigation lights on ships, or sometimes as guiding lights for lost persons (Ball 1938: 498–500). In India, the earliest country in which fine gemstones were known, belief in luminous gems dates back some twenty-five centuries.