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Argentium silver 935 is a modern sterling silver alloy, containing 93.5% silver, in which the traditional alloy (92.5% silver + 7.5% copper) is modified by removing some of the copper and adding the metalloid germanium.〔Peter Johns (1997) Firestain Resistant Silver Alloys. Santa Fe Symposium On Jewellery Manufacturing Technology. ISBN 0-931913-25-X〕 Argentium silver 960 is a high purity jewellery alloy that meets the hallmarking requirements for the U.K. Britannia standard. The 960 alloy modifies the conventional Britannia silver composition (95.84 silver, balance copper) with the addition of germanium. ==Origins and description== Argentium Silver is the result of research by Peter Johns at the Art and Design Research Institute (ADRI), School of Art & Design, Middlesex University. The project began in 1990 with research on the effects of germanium additions to silver alloys. Germanium was discovered to impart the following properties to sterling silver:〔Johns, Peter and Davis, Sam (2007) The properties and applications of Argentium (TM) Sterling Silver. In: 31st IPMI Conference (International Precious Metals Institute)〕 * Firescale elimination * High tarnish resistance * Precipitation hardening and simple heat-hardening properties * Increased ductility * Increased thermal and electrical resistance (making alloys suitable for welding and laser forming) * Environmental advantages (associated with not having to remove or plate over firescale) Many of these properties significantly affect the traditional methods of working silver. For instance the absence of firescale eliminates tedious and time-consuming steps required by the silver worker using traditional sterling silver. It also eliminates the need for plating the final product which is often done on manufactured items because of the problems introduced by firescale. Tarnish resistance is of significant importance to both silver workers and the wearer of silver jewellery. Argentium Silver is patented and trademarked by Argentium Silver Company, UK. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Argentium sterling silver」の詳細全文を読む スポンサード リンク
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