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Color shades have several different causes. The printer may use a different ink; in the early days, inks were made up in batches as needed, and were rarely consistent. In such cases, the shade provides information about when the stamp was made, and possibly even identify a particular printing.
A collection with "one of each" stamp may have rows of stamps placed on each page, while a specialist's page might have a dozen examples of similar stamps, differing in watermarks, colour shades, perforations etc. Traditionally page creation has been done by hand using pen and ink; in recent years, however, with the advent of personal computers ...
This pair of coil stamps clearly shows the pattern of perforation holes; also, on the left side of the pair, the stamp was torn, while on the right the perforations were cut with scissors or knife. For postage stamps , separation is the means by which individual stamps are made easily detachable from each other.
One would imagine that overprints should be easier for a forger to falsify. It is just a simple matter of applying a few letters to a stamp with black ink. Paying attention to detail can reward a philatelic sleuth. The stamps of Bangkok from the 1880s were produced by overprinting each stamp a single letter "B" on stamps of the Straits Settlements.
Certain latex rubber compounds can be laser engraved; for example these can be used to fabricate inking-stamps. Paper masking tape is sometimes used as a pre-engraving overcoat on finished and resiny woods so that cleanup is a matter of picking the tape off and out of the unengraved areas, which is easier than removing the sticky and smoky ...
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"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.
The artist does this by dipping a needle in ink and turning on a rotary motor which quickly jabs ink into the dermis over and over. Modern tattoo machines pierce the skin at a frequency of 50 to ...