5/17/2023 0 Comments Airmail stampOne method was a continuous tagging where the taggant was applied from edge to edge of the sheet of stamps. Tagging also was applied to the stamp in several different ways. The postal service used three basic methods for making a stamp tagged tagging could be applied on top of the printed stamp, it could be mixed with paper pulp, or it could be mixed with the printers ink. But note that ‘tagging omitted’ errors do exist for stamp which were only issued in tagged form. These were not ‘errors’ but rather just normal varieties of the same stamp issue. This was sometimes due to a stamp first being issued un-tagged but later in the production run tagging was added. Since that time hundreds of US stamp have been issued with tagging and some stamp were issued in both tagged and un-tagged versions. The first regular production US stamp with tagging was the 1963 8¢ Airmail issue #C64a and was followed with the first commemorative stamp tagged stamp: 5 cent City Mail Delivery issue #1238. Tagging is typically invisible to the human eye. By applying the fluorescent compounds (called tagging) to the stamp, special equipment could then detect the corner the stamp was in and orientate the mail piece properly for cancelling. The US Postal Service began experimenting with fluorescent compounds sometime around 1954 these compounds were primarily phosphor based and glowed when exposed to ultraviolet (UV) light. As a repetitive task, this was well suited for a technology solution. Automated cancellers required the mail piece to be properly orientated so the cancel could be applied correctly. This is best for identification of Great Britain Machins and for US papers.Īs the postal service grew and evolved, the speed and efficiency of the cancelling process became paramount. Longwave UV is often used in leak detection (in conjunction with fluorescent dyes) and is useful for mineral studies. Longwave UV light, or black light, extends from 320 to 380 nm with a peak in energy at about 365 nm. Mediumwave UV lamps are generally used in electrophoresis documentation procedures and to identify minerals by their fluorescent response. Mediumwave UV light extends from 280 to 320 nm with a peak in energy at about 312 nm. It is also used for identifying US stamp tagging. Ultraviolet equipment that produces light in the shortwave region is typically used for toxicology, fluorochemistry, and germicidalĪpplications. For best results the shortwave UV source should be appropriately filtered (not unfiltered). Shortwave UV light extends from 180 to 280 nm with a peak in energy at about 254 nm. The ultraviolet spectrum ranges from 180 to 400 nanometers (nm) and is divided into three categories: Weight 20 lbs.Ultraviolet light (UV) is form of the electromagnetic spectrum that is adjacent to and greater in energy than visible light. weight 4 lbs.), or Medium and Large Flat Rate Boxes (Max. Weight 70 lbs), Flat Rate Envelopes or Small Flat Rate Boxes (Max. Priority Mail International pricing varies by country price group, either in packages charged by weight (Max. For all other GXG items, prices based on dimensional weight or actual weight, whichever is greater, and country price group. Prices for items mailed in USPS-produced GXG envelopes based on weight and country price group. weight 4 lbs.) Back ^ to legal disclaimer 10ġ1. Weight 70 lbs) or Flat Rate Envelopes (Max. Priority Mail Express International pricing varies by country price group, either in packages charged by weight (Max. Visit the International Mail Manual for Priority Mail International insurance details. Not available for Priority Mail International Flat Rate Envelopes or Small Flat Rate Boxes. Visit the International Mail Manual for Priority Mail Express International insurance details. Limitations may apply for certain destinations. Actual number of days may vary based on origin, destination, and customs delays. You must pay postage and mail your letter or package at a Post Office™ location. You can receive date-certain service with a money-back guarantee to select locations. See Publication 141 for more information on insurance. See Publication 141: Global Express Guaranteed Service Guide for more detailed information. See Publication 141 for more information.
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