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2. Glossary of pottery terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_pottery_terms

   A small mark applied to the underside, the back, of articles to give information such as the identity of maker. Various techniques to apply the stamp exist. Ball clay A secondary clay. Ball clays invariably also contain various non-clay minerals, and sometimes organic matter. They commonly exhibit high plasticity and high dry strength.( Ball mill

3. Scott catalogue - Wikipedia

   en.wikipedia.org/wiki/Scott_catalogue

   The Scott numbering system assigns plain numbers for regular mail stamps, and uses capital letter prefixes for special-purpose types, such as "B" for semi-postals and "C" for airmail. The numbers are generally consecutive; there are gaps among older stamps, where some numbered types were later renumbered, and among newer stamps where Scott has ...

4. List of artworks on stamps of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_artworks_on_stamps...

   Many artists have had the same work appear on different U.S. postages stamps and many artists have had multiple works appear on U.S. postage stamps. The list does not include artists who were commissioned by the U.S. Post Office Department (or its successor, the United States Postal Service) to specifically create artwork for a postage stamp.

5. Cylinder seal - Wikipedia

   en.wikipedia.org/wiki/Cylinder_seal

   Most Mesopotamian cylinder seals form an image using depressions in the cylinder surface (see lead photo above) to make bumps on the impression and are used primarily on wet clay; but some cylinder seals (sometimes called roller stamps) print images using ink or similar using raised areas on the cylinder (such as the San Andrés cylinder seal ...

6. Postage stamp paper - Wikipedia

   en.wikipedia.org/wiki/Postage_stamp_paper

   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 provided security against fraud and has aided in the ...

7. Grill (philately) - Wikipedia

   en.wikipedia.org/wiki/Grill_(philately)

   "G" grill on a stamp of the 1869 issue. A grill on a postage stamp is an embossed pattern of small indentations intended to discourage postage stamp reuse.Used in the United States in the 1860s and 1870s, they were designed to allow the ink of the cancellation to be absorbed more readily by the fibres of the stamp paper, making it harder to wash off the cancellation.