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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 ...
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 ...
Rubberized explosives are flat sheets of solid but flexible material, a mixture of a powdered explosive (commonly RDX or PETN) and a synthetic or natural rubber compound. Rubberized sheet explosives are commonly used for explosive welding and for various other industrial and military applications. Rubberized explosives can be cut to specific ...
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]
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]
Barium sulfate (or sulphate) is the inorganic compound with the chemical formula Ba SO 4.It is a white crystalline solid that is odorless and insoluble in water.It occurs in nature as the mineral barite, which is the main commercial source of barium and materials prepared from it.
Election mail is delivered even if you don't use enough stamps. However, county boards of elections (and ultimately taxpayers) are on the hook for unpaid postage fees, so it's good to use the ...
A composite, thin PDMS stamp with a rigid back support has been used for patterning to help solve this problem. Magnetic field assisted micro contact printing: to apply a homogeneous pressure during the printing step, a magnetic force is used. For that, the stamp is sensitive to a magnetic field by injecting iron powder into a second layer of PDMS.