Posted by admin | Posted in Uncategorized | Posted on 20-07-2009
Tags: black silver, black silver griffeys, black silver snake, black silverfish, black silverware, design, inspiration, photography, portfolio, webdesign
925 Sterling silver : Hallmarks | Tarnish and Corrosion and its remedies
What are silver hallmarks ?
Over the years, most countries in the world have developed their own systems of hallmarking silver. The purpose of hallmark application is manifold:
- To indicate the purity of the silver alloy used in the manufacture or hand-crafting of the piece.
- To identify the silversmith or company that made the piece.
- To note the date and/or location of the manufacture.
As the purity of the silver decreases, the problem of corrosion or tarnishing increases.
Chemically, silver is not very reactive — it does not react with oxygen or water at ordinary temperatures, so does not easily form a silver oxide. However, other metals in the alloy, usually copper, may react with oxygen in the air.
The black silver sulfide (Ag2S) is among the most insoluble salts in aqueous solution, a property that is exploited for separating silver ions from other positive ions.
Sodium chloride (NaCl) or common table salt is known to corrode silver-copper alloy, typically seen in silver salt shakers where corrosion appears around the holes in the top.
Several products have been developed for the purpose of polishing silver that serve to remove sulfur from the metal without damaging or warping it. Because harsh polishing and buffing can permanently damage and devalue a piece of antique silver, valuable items are typically hand-polished to preserve the unique patinas of older pieces. Techniques such as wheel polishing, which are typically performed by professional jewelers or silver repair companies, are reserved for extreme tarnish or corrosion.
By Lustre Jewel , http://www.lustrejewel.com .
For latest designs ,good quality and affordable 925 sterling silver jewelry .
About the Author
Lustre Jewel (www.lustrejewel.com) e-store provides selected designer jewelry at the most competitive rates in 925 Sterling silver jewelry market. The prices are low in comparison to other stores as we directly get supply products from manufacturers. “Best quality jewelry at best price” is motto of all staff of Lustre Jewel. Give it a try and you will know soon why we have many satisfied returning customers. Customer satisfaction is of the utmost importance at the end of any transaction .We understand this basic principle of business and are always making continuous improvements in our efforts to get better with every passing day .
Raiders Music Video “Silver and Black Attack” 1986
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