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With modern laser-engraving technology, personalized rubber stamps can be made in minutes. Rubber stamps for business commonly show an address, corporate logo and business registration number. [5] [6] Some stamps also have movable parts that allow the user to adjust the date or the wording of the stamp. They are used to date incoming mail, as ...
The following types of material are excluded (although they may also be collected by chemical stamp enthusiasts): Postal stationery, [14] e.g. a postcard depicting a chemist with a non-chemical stamp affixed; Cinderella, local, private or personal issues, i.e. unofficial stamps; Non-postal stamps, e.g. revenue stamps [15]
Barium, typically as barium nitrate imparts a yellow or "apple" green color to fireworks; [30] for brilliant green barium chloride is used. Barium peroxide is a catalyst in the aluminothermic reaction for welding rail tracks. It is also a green flare in tracer ammunition and a bleaching agent. [31] Barium titanate is a promising electroceramic ...
The following types of material are excluded (although they may also be collected by crystallography stamp enthusiasts): Postal stationery, [10] e.g. a postcard depicting a crystallographer with a non-crystallographic stamp affixed; Cinderella, local, private or personal issues, i.e. unofficial stamps; Non-postal stamps, e.g. revenue stamps [11]
Also used in flash powders and some military infrared flares. Barium also serves as a stabilizer for the mixtures; [3] decomposes at higher temperatures than nitrates of lighter metals and promotes higher burning temperatures. With aluminium produces bright silver sparks; when used with aluminium, addition of boric acid as stabilizer is advised.
Scratch and sniff technology is the application of a fragrant coating to items such as stickers or paperboard, so that when the coating is scratched it releases an odor that is normally related to the image displayed under the coating.
The first use was by Sierra Leone in 1964, [8] and the United States tried it later on a 1974 Christmas stamp; this was judged a failure and was not reintroduced until 1989 when it gradually became widespread. In the 1990s, the U.S. Post Office began transitioning from water-based stamps into the use of self-adhesive stamps.
Along with foil stamping machines, among the commonly used tools in hot stamping are dies and foil. [4] Dies may be made of metal or silicone rubber, and they may be shaped directly or cast. They can carry high levels of detail to be transferred to the surface and may be shaped to accommodate irregularities in the surface.