why silver jewellery gets tarnished
Answers
Answer:
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Explanation:
When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish. This process is called tarnishing, as explained below in The science of silver tarnish and its cause. ... Tarnish generally disfigures a silver object.
Explanation:
When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish. This process is called tarnishing, as explained below in The science of silver tarnish and its cause. Protecting silver objects from tarnishing is an important task for heritage professionals.
Tarnish generally disfigures a silver object. It can be removed by polishing or other techniques, but this cleaning can be labour intensive. Moreover, each time an object tarnishes and is cleaned, some silver is lost. On silver-plated objects, polishing can damage the thin layer of silver plating, or even remove it entirely. Hence, if possible, it is best to prevent the object from tarnishing, especially for museum or heritage pieces.
If a silver object is to be kept from tarnishing, it must be protected from sulfur-containing gases. These gases come from a variety of sources. It may be impossible to prevent silver from tarnishing when it is on open display in a historic house. Even placing silver in a sealed display case may not protect it if the display case is made from inappropriate materials or if it is not airtight enough.