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Coin Capsule
A coin capsule or "slab" is a type of plastic capsule designed to prevent coins from becoming damaged by protecting it from outside contaminants, scratches and drops while allowing the coin to be viewed through transparent plastic. Coin capsules are commonly used by coin collectors, numismatists A numismatist is a specialist in numismatics ("of coins"; from Late Latin ''numismatis'', genitive of ''numisma''). Numismatists include collectors, specialist dealers, and scholars who use coins and other currency in object-based research. Altho ... or coin grading services to store and keep coins safe. The varied nature of coin sizes has led to a wide range of differently sized capsules becoming available each offer different levels or protection or security. Some types of capsules are designed with the ability to be reopened while others, once closed cannot be reopened without damaging the capsule. Now coin capsules are coming with adjustable foams inside it so that coin doesn't move ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Contaminants
Contamination is the presence of a constituent, impurity, or some other undesirable element that spoils, corrupts, infects, makes unfit, or makes inferior a material, physical body, natural environment, workplace, etc. Types of contamination Within the sciences, the word "contamination" can take on a variety of subtle differences in meaning, whether the contaminant is a solid or a liquid, as well as the variance of environment the contaminant is found to be in. A contaminant may even be more abstract, as in the case of an unwanted energy source that may interfere with a process. The following represent examples of different types of contamination based on these and other variances. Chemical contamination In chemistry, the term "contamination" usually describes a single constituent, but in specialized fields the term can also mean chemical mixtures, even up to the level of cellular materials. All chemicals contain some level of impurity. Contamination may be recognized or not and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transparency And Translucency
In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass through the material without appreciable scattering of light. On a macroscopic scale (one in which the dimensions are much larger than the wavelengths of the photons in question), the photons can be said to follow Snell's law. Translucency (also called translucence or translucidity) allows light to pass through, but does not necessarily (again, on the macroscopic scale) follow Snell's law; the photons can be scattered at either of the two interfaces, or internally, where there is a change in index of refraction. In other words, a translucent material is made up of components with different indices of refraction. A transparent material is made up of components with a uniform index of refraction. Transparent materials appear clear, with the overall appearance of one color, or any combination leading up to a brilliant spectrum of every color. The opposit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coin Collectors
Coin collecting is the collecting of coins or other forms of minted legal tender. Coins of interest to collectors often include those that were in circulation for only a brief time, coins with mint errors, and especially beautiful or historically significant pieces. Coin collecting can be differentiated from numismatics, in that the latter is the systematic study of currency as a whole, though the two disciplines are closely interlinked. A coin's grade is a main determinant of its value. Commercial organizations offer grading services and will grade, authenticate, attribute, and encapsulate most coins. History People have hoarded coins for their bullion value for as long as coins have been minted. However, the collection of coins for their artistic value was a later development. Evidence from the archaeological and historical record of Ancient Rome and medieval Mesopotamia indicates that coins were collected and catalogued by scholars and state treasuries. It also seems pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numismatists
A numismatist is a specialist in numismatics ("of coins"; from Late Latin ''numismatis'', genitive of ''numisma''). Numismatists include collectors, specialist dealers, and scholars who use coins and other currency in object-based research. Although use of the term numismatics was first recorded in English in 1799, people had been collecting and studying coins long before this, all over the world. The first group chiefly derives pleasure from the simple ownership of monetary devices and studying these coins as private amateur scholars. In the classical field amateur collector studies have achieved quite remarkable progress in the field. Examples are Walter Breen, a well-known example of a noted numismatist who was not an avid collector, and King Farouk I of Egypt was an avid collector who had very little interest in numismatics. Harry Bass by comparison was a noted collector who was also a numismatist. The second group are the coin dealers. Often called professional numismatist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Third-party Grading
Third Party Grading (TPG) refers to coin grading & banknote grading, grading of stamps, cards, comic books, etc., authentication, attribution, and encapsulation by independent certification services. These services will, for a tiered fee, "slab" an item. Professional Coin Grading Service (PCGS), Numismatic Guaranty Corporation (NGC), Independent Coin Graders (ICG), and ANACS are the most popular and credible services. Together they have certified over 80 million coins. All four firms guarantee the grades and authenticity of their certified coins. Certified Acceptance Corporation (CAC) is a coin certification service which certifies—and makes a market in—certain high-end coins already certified by PCGS or NGC. History Modern third-party coin grading service is presently defined by the tamper-resistant plastic "slab," which encapsulates both the item and its certification. Before the slab, there was no way to permanently tie the certificate to the actual item being certifie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coin Grading
Coin grading is the process of determining the grade or condition of a coin, one of the key factors in determining its value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which they’re minted. Several grading systems have been developed. Certification services professionally grade coins for tiered fees. Overview A "grade" measures a coin's appearance. There are generally five main components which determine a coin's grade: strike, surface preservation, luster, coloration and eye appeal. Grading is subjective and even experts can disagree about the grade of a given coin. History U.S. coin grading has evolved over the years to a system of finer and finer grade distinctions. Originally, there were only two grades, new and used. This changed to the letter grading system beginning with the lowest grade – ''Basal State'' (also ''Poor'' (PO)), then continuing ''Fair'' (Fr), ''Abou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numismatics
Numismatics is the study or collection of currency, including coins, tokens, paper money, medals and related objects. Specialists, known as numismatists, are often characterized as students or collectors of coins, but the discipline also includes the broader study of money and other means of payment used to resolve debts and exchange goods. The earliest forms of money used by people are categorised by collectors as "Odd and Curious", but the use of other goods in barter exchange is excluded, even where used as a circulating currency (e.g., cigarettes or instant noodles in prison). As an example, the Kyrgyz people used horses as the principal currency unit, and gave small change in lambskins; the lambskins may be suitable for numismatic study, but the horses are not. Many objects have been used for centuries, such as cowry shells, precious metals, cocoa beans, large stones, and gems. Etymology First attested in English 1829, the word ''numismatics'' comes from the adjective ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
