Some of the Queen Elizabeth II stamps were printed on Helicon phosphorous paper, it is a chemical substance of the zinc sulphide group and has been incorporated into stamps in two different ways, either in the ink with which the stamps are printed, or included in the surface coating of the stamp paper.
Helecon becomes luminescent in the orange-red spectrum when subjected to ultra-violet rays, and retains the luminescence for a fraction of a second after the UV light is removed.
The complete Queen Elizabeth II collection (1953-1965) of pre-decimal stamps are in mint unhinged condition, and although the collection is complete with all issued stamps, such things as varieties, shades, paper thickness, overprints with a different perforation gauge, and the size and position of the overprint is ongoing.
Please use the link to view the collection and click any stamp to enlarge it, the arrows on the edge of the screen can be used as a manual PowerPoint.
The complete collection of 1966 stamps will soon be uploaded to the Decimal section.