Phosphor bands were introduced on British stamps from 1959 as a replacement for the previous graphite lined stamps as an aid in the mechanical sorting of mail.
Phosphor tagging
Tercentenary - 300th anniversary.
Tête-Bêche (French) - head to tail. Stamps printed upside down in relation to each other.
Phosphor Stamps are overprinted, inked or impregnated with phosphorescent or ‘fluorescent' substances for use in electronic letter-facing and postmarking machines.
Phosphor: A chemical substance used in the production of selected stamps to activate machines that automatically cancel mail. The machines react to the phosphor under ultraviolet light.
Phosphor / Helecon:
An invisible treatment that can only be seen using a UV (purple) light that confirms a stamp is genuine.
Phosphorescent: ...
Phosphored Ink - ink to which a clear taggant compound has been added. Phosphored ink is infrequently used on stamps, but is frequently used for postal stationery.
Phosphor Stamps - Stamps which have been coated with a flourescent substance used for detection in the mail sorting system.
Photogravure - A special type of recessed printing involving designs being etched onto plates.
Phosphor: A chemical substance used in stamp production to activate machines that automatically cancel mail. The machines react to the phosphor under ultraviolet light. In 1959, Great Britain began to print phosphor lines on some of its stamps.
Surface Phosphor Paper (SP)
Stamp printing paper, usually coated papers for stamps printed by gravure or offset lithography, treated with taggant that adheres to the surface of the paper.
Phosphor, otherwise known as the “invisible ink', is luminescent when struck with an ultraviolet light.
phosphorescence
Self-adhesive booklets ...
References
Fundamentals of Philately, L.N. Williams (published by the American Philatelic Society) ...
Papir, Fosforiserende: (Dan., Nor.) phosphorescent paper.
Papir, Fotografisk: (Dan.) photographic paper.
Papir, Gennemfarvet: (Dan.) paper colored throughout.
Papir, Getontes: (Dan.) tinted paper.
- Abbreviation for Phosphor.
Phosphor - Any substance emitting visible light when stimulated by visible or invisible light.
Tagging. The impregnation of phosphorescent dies into the paper used to print a stamp. When "read" by special Ultra Violet machines during mail processing, the phosphors determine the face value of the stamp(s) being used to pay postage.
This is caused by the miss registration of the phosphor tagging in relation to the ink.
No tagging was used for the 10,000,000 production run, presumably because of the stamp's intended purpose for use on overseas parcels, which are not scanned by phosphor sensing machines.
A type of paper devised by Harrison & Sons to prevent the problem of ink absorption in the drying process. The paper contained a phosphorescent ink that was sensed by automatic mail handling machinery.
Advertisements on Postmarks ...
Topics to be covered include colors, face values, numerals, papers, gums, phosphor band variations, perforations, regional issues, methods of printing, booklets, se-tenant combinations, and postal history.
 See also: Stamp, Used, Cover, Perforation, Machin
  
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