WebA phosphor is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or … WebMany U.S. stamps have features that help automate mail – “taggant” of phosphorescent or fluorescent material that’s “read” by an optical sensor. Phosphorescent tagging can be seen under shortwave UV, while fluorescent tagging glows under longwave UV. Shortwave UV light can also be used to detect different kinds of paper and repairs ...
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WebShortwave UV 254nm - 266nm is used to check for the presence of phosphorescence. Phosphor is used for postcode tagging dots and on the postage stamps of Great Britain from the 1960's onwards. Is also present on stamps from Canada (older issues), Finland, Greece, Israel, Mexico (older issues), USA. Detecting the presence of phosphor: WebMar 9, 2024 · Phosphor stamps are better in triggering the automatic facing & cancelling machines than non phosphor, or ordinary stamps. That was the sole purpose behind the … ray white new farm off market
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WebThe archetypal tool to detect phosphor papers and inks for the majority of the 20th Century Machin stamps of Great Britain, Israel, USA, Finland and the early phosphors of , Norway, Mexico, France, Hong Kong, People's Republic of China, Russia and later issues of Canada and Mexico. The lamp has a spectrum of 254 to 390 nm (nanometers) and therefore … WebMar 9, 2024 · Phosphor stamps are better in triggering the automatic facing & cancelling machines than non phosphor, or ordinary stamps. That was the sole purpose behind the application of phosphor bands. Going back some 50 or so years: an envelope with an ordinary stamp placed anywhere on it was at risk of not being cancelled unless the stamp … WebOct 27, 2003 · The Stanley Gibbons Great Britain Specialized Stamp Catalogue, volumes 3 and 4, list phosphor-band, paper, gum and printer varieties. The Connoisseur Catalogue of Machin Stamps provides even greater detail in 376 densely packed pages. And the ultimate is The Complete Deegam Machin Handbook. You can find just about anything you ever … ray white newcastle lake macquarie