| What are silver hallmarks ? | | | | is exploited for separating silver ions from other |
| Over the years, most countries in the world have | | | | positive ions. |
| developed their own systems of hallmarking | | | | Sodium chloride (NaCl) or common table salt is |
| silver. The purpose of hallmark application is | | | | known to corrode silver-copper alloy, typically |
| manifold: | | | | seen in silver salt shakers where corrosion |
| - To indicate the purity of the silver alloy used in | | | | appears around the holes in the top. |
| the manufacture or hand-crafting of the piece. | | | | Several products have been developed for the |
| - To identify the silversmith or company that | | | | purpose of polishing silver that serve to remove |
| made the piece. | | | | sulfur from the metal without damaging or |
| - To note the date and/or location of the | | | | warping it. Because harsh polishing and buffing can |
| manufacture. | | | | permanently damage and devalue a piece of |
| As the purity of the silver decreases, the problem | | | | antique silver, valuable items are typically |
| of corrosion or tarnishing increases. | | | | hand-polished to preserve the unique patinas of |
| Chemically, silver is not very reactive — it does | | | | older pieces. Techniques such as wheel polishing, |
| not react with oxygen or water at ordinary | | | | which are typically performed by professional |
| temperatures, so does not easily form a silver | | | | jewelers or silver repair companies, are reserved |
| oxide. However, other metals in the alloy, usually | | | | for extreme tarnish or corrosion. |
| copper, may react with oxygen in the air. | | | | By Lustre Jewel , . |
| The black silver sulfide (Ag2S) is among the most | | | | For latest designs ,good quality and affordable 925 |
| insoluble salts in aqueous solution, a property that | | | | sterling silver jewelry . |