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Microcontact printing (or μCP) is a form of soft lithography that uses the relief patterns on a master polydimethylsiloxane (PDMS) stamp or Urethane rubber micro stamp [1] to form patterns of self-assembled monolayers (SAMs) of ink on the surface of a substrate through conformal contact as in the case of nanotransfer printing (nTP). [2]
All barcoded stamps are self-adhesive. Existing definitive stamps issued from 15 February 1971 to 31 January 2022 remain valid until 31 January 2023: since 31 March 2022, they can be indefinitely exchanged for the barcoded series. [18] The 2022 issue was the last release in the Machin series prior to the death of Elizabeth II.
During the first seven weeks of the Civil War, the U.S. Post Office still delivered mail from the seceded states. Mail that was postmarked after the date of a state's admission into the Confederacy through May 31, 1861, and bearing U.S. (Union) postage is deemed to represent 'Confederate State Usage of U.S. Stamps'. i.e., Confederate covers franked with Union stamps. [4]
A rubber stamp is an image or pattern that has been carved, molded, laser engraved, or vulcanized onto a sheet of rubber. Rubber stamping, also called stamping, is a craft in which some type of ink made of dye or pigment is applied to a rubber stamp, and used to make decorative images on some media, such as paper or fabric. [ 1][ 2][ 3][ 4]
Benjamin Franklin — George Washington The First U.S. Postage Stamps, issued 1847. The first stamp issues were authorized by an act of Congress and approved on March 3, 1847.[ 20] The earliest known use of the Franklin 5¢ is July 7, 1847, while the earliest known use of the Washington 10¢ is July 2, 1847.
Low value definitives, 1873–80 (coloured corner letters) Low value definitives, halfpenny to 5d 1880–81. Penny Lilac 1881, the most issued Victorian stamp. High value definitives, 2/6 to £1 1883–84. Lilac and Green low value definitives 1883. Jubilee issue postage stamps 1887–92.
A sheet of National Telephone Company postage stamps. Postage stamp paper is the foundation or substrate of the postage stamp to which the ink for the stamp's design is applied to one side and the adhesive is applied to the other. The paper is not only the foundation of the stamp but it has also been incorporated into the stamp's design, has ...
Self-adhesive stamp. A self-adhesive stamp is a postage stamp with a pressure-sensitive adhesive that does not require moistening in order to adhere to paper. They are usually issued on a removable backing paper. Stamp collectors have criticized the format, because the rubber-based adhesive used tends to yellow the stamps progressively.
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