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Postage Stamp Color
The colors of postage stamps are at once obvious, and among the most difficult areas of philately. Different denominations of stamps have been printed in different colors since the very beginning; as with their successors, postal clerks could distinguish the Penny Black and Two pence blue more quickly by color than by reading the value, and the practice generally continues today. In practice, the actual color of a stamp may vary, and while collectors will pay high prices for rare shades, it may not be easy to tell those apart from variations caused by age, light, chemicals, and other factors. Stamp colors are routinely described by color name rather with any sort of a numerical system like CMYK; several color guides showing a selection of colors have been produced, but are not especially popular with collectors. Nearly all stamps get their color from inks printed on white or light-colored paper; the handful of exceptions include early issues of Natal consisting only of embossing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GB Edward VIII Postage Stamps
GB, or Gb may refer to: Places * United Kingdom (ISO 3166-1 code), a sovereign country situated off the north-western coast of continental Europe ** Great Britain, an island situated off the north-western coast of continental Europe ** Kingdom of Great Britain (1707–1800), a predecessor country of the United Kingdom * Gilgit-Baltistan, a region in northern Pakistan * Guinea-Bissau, a sovereign state in West Africa * Green Bay, Wisconsin, United States * Great Barrington, Massachusetts, United States Businesses and organisations * GB Airways, a British airline * Gardner Bender, a manufacturer of professional electrician's tools and supplies * Girls' Brigade, a Christian organization for girls * Grande Bibliothèque, a large public library in Montreal * University of Wisconsin–Green Bay, an American university * ABX Air (IATA airline designator GB), a cargo airline * GB Glace, a Swedish ice cream company * Griesedieck Brothers beer, an American beer brand * GB Supermarkets, a B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universal Postal Union
The Universal Postal Union (UPU, french: link=no, Union postale universelle), established by the Treaty of Bern of 1874, is a specialized agency of the United Nations (UN) that coordinates postal policies among member nations, in addition to the worldwide postal system. The UPU contains four bodies consisting of the Congress, the Council of Administration (CA), the Postal Operations Council (POC) and the International Bureau (IB). It also oversees the Telematics and Express Mail Service (EMS) cooperatives. Each member agrees to the same terms for conducting international postal duties. The UPU's headquarters are located in Bern, Switzerland. History Bilateral treaties Before the establishment of the UPU, every pair of countries that exchanged mail had to negotiate a postal treaty with each other. In the absence of a treaty providing for direct delivery of letters, mail had to be forwarded through an intermediate country. Postal arrangements were complex and overlapping. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New South Wales
) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , established_date = Colony of New South Wales , established_title2 = Establishment , established_date2 = 26 January 1788 , established_title3 = Responsible government , established_date3 = 6 June 1856 , established_title4 = Federation , established_date4 = 1 January 1901 , named_for = Wales , demonym = , capital = Sydney , largest_city = capital , coordinates = , admin_center = 128 local government areas , admin_center_type = Administration , leader_title1 = Monarch , leader_name1 = Charles III , leader_title2 = Governor , leader_name2 = Margaret Beazley , leader_title3 = Premier , leader_name3 = Dominic Perrottet (Liberal) , national_representation = Parliament of Australia , national_representation_type1 = Senat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Color Changeling
Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associated with objects or materials based on their physical properties such as light absorption, reflection, or emission spectra. By defining a color space, colors can be identified numerically by their coordinates. Because perception of color stems from the varying spectral sensitivity of different types of cone cells in the retina to different parts of the spectrum, colors may be defined and quantified by the degree to which they stimulate these cells. These physical or physiological quantifications of color, however, do not fully explain the psychophysical perception of color appearance. Color science includes the perception of color by the eye and brain, the origin of color in materials, color theory in art, and the physics of electromagn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Postage Stamp Reuse
Postage stamp reuse is the technique of fraudulently reusing postage stamps from sent mail to avoid paying the cost of postage. Reuse A postage stamp is a small piece of paper attached to mail that indicates that the postage (the cost of sending the mail) has been paid. Because stamps are sent on most mail, the stamp on a received item can be removed and placed on a different piece of mail to be sent, thus reusing the stamp without paying the proper postage. In many countries, such as the United States, reuse of used stamps, whether cancelled or not, is illegal. Prevention Mute cancellation (''killer'') After use, many stamps are marked by a cancellation by the postal system, which defaces the stamp and prevents its reuse. The cancellation usually includes a killer placed on the stamp that has black bars, cork impressions or other obstructive shapes to deface the stamp. Instead of using an entirely separate mark, some countries use their postmark, placed on the stamp, to cancel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fugitive (pigment)
Fugitive pigments are impermanent pigments that lighten, darken, or otherwise change in appearance or physicality over time when exposed to environmental conditions, such as light, temperature, humidity, or pollution. Fugitive pigments are present in types of paint, markers, inks etc., which are used for temporary applications. Fugitive inks which washed away when soaked in water were sometimes used deliberately to prevent postage stamps being removed from envelopes by soaking, and reused (e.g., the Queen Victoria Lilac and Green Issue). While permanent pigments are usually used for painting Painting is the practice of applying paint, pigment, color or other medium to a solid surface (called the "matrix" or "support"). The medium is commonly applied to the base with a brush, but other implements, such as knives, sponges, and ...s, painters have made work wholly or partially with fugitive pigments for a number of reasons: availability and cost of pigments; being more ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, and many smaller islands within the British Isles. Northern Ireland shares a land border with the Republic of Ireland; otherwise, the United Kingdom is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. The total area of the United Kingdom is , with an estimated 2020 population of more than 67 million people. The United Kingdom has evolved from a series of annexations, unions and separations of constituent countries over several hundred years. The Treaty of Union between the Kingdom of England (which included Wales, annexed in 1542) and the Kingdom of Scotland in 170 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated between the Baltic and North seas to the north, and the Alps to the south; it covers an area of , with a population of almost 84 million within its 16 constituent states. Germany borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The nation's capital and most populous city is Berlin and its financial centre is Frankfurt; the largest urban area is the Ruhr. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity. A region named Germania was documented before AD 100. In 962, the Kingdom of Germany formed the bulk of the Holy Roman Empire. During the 16th ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultramarine
Ultramarine is a deep blue color pigment which was originally made by grinding lapis lazuli into a powder. The name comes from the Latin ''ultramarinus'', literally 'beyond the sea', because the pigment was imported into Europe from mines in Afghanistan by Italian traders during the 14th and 15th centuries. Ultramarine was the finest and most expensive blue used by Renaissance painters. It was often used for the robes of the Virgin Mary and symbolized holiness and humility. It remained an extremely expensive pigment until a synthetic ultramarine was invented in 1826. Structure The pigment consists primarily of a zeolite-based mineral containing small amounts of polysulfides. It occurs in nature as a proximate component of lapis lazuli containing a blue cubic mineral called lazurite. In the Colour Index International, the pigment of ultramarine is identified as P. Blue 29 77007. The major component of lazurite is a complex sulfur-containing sodium-silicate (Na8–10Al6Si6O24 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbian Issue
The Columbian Issue, also known as the Columbians, is a set of 16 postage stamps issued by the United States to commemorate the World's Columbian Exposition held in Chicago during 1893. The finely-engraved stamps were the first commemorative stamps issued by the United States, depicting various events during the career of Christopher Columbus and are presently much valued by collectors. History The Columbian stamps were supplied by the American Banknote Company, which had a four-year contract for the production of United States postage stamps beginning December 1, 1889. However, where previous contracts had required printing companies to provide designs and plates at their own expense for any new stamps required by the Post Office, the 1889 contract specified that the Post Office would pay those costs. Indeed, Postmaster John Wanamaker (of department store fame) executed a new contract with American Banknote specifically for the Columbian stamps without any competitive bidding pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Color Error
In optics, chromatic aberration (CA), also called chromatic distortion and spherochromatism, is a failure of a lens to focus all colors to the same point. It is caused by dispersion: the refractive index of the lens elements varies with the wavelength of light. The refractive index of most transparent materials decreases with increasing wavelength. Since the focal length of a lens depends on the refractive index, this variation in refractive index affects focusing. Chromatic aberration manifests itself as "fringes" of color along boundaries that separate dark and bright parts of the image. Types There are two types of chromatic aberration: ''axial'' (''longitudinal''), and ''transverse'' (''lateral''). Axial aberration occurs when different wavelengths of light are focused at different distances from the lens (focus ''shift''). Longitudinal aberration is typical at long focal lengths. Transverse aberration occurs when different wavelengths are focused at different positions in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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