Silver cooked silver silver foot silver mainly have the following two differences:
One, the difference in silver content.
1, raw silver is also known as the "old man beard". Naturally occurring, not burned silver. Means that raw silver is naturally occurring, without refining and processing, containing other substances, silver content is relatively low.
2, cooked silver is in the raw silver on the basis of refining and become. 925 silver is 92.5% silver content, 99 silver is 99% silver content.
3, silver refers to the silver content of not less than 990 kilograms called silver.
Two, the use is not the same.
Silver according to Ming Li Shizhen "Compendium of Materia Medica - gold and stone - silver" cited Su Song said: "Silver is born in the silver mine, such as hard tin, its gold pit in the proceeds of the soil and stone, leakage into the strip, such as the silk hair, the natives called the old man beard. Extremely difficult to obtain. Fang Shu with raw silver, must get this is true." Raw silver can not be used directly, need to be processed.
Cooked silver and silver is generally used to processed into bracelets, pendants, long life locks and other silver jewelry. Foot silver jewelry usually has several marks, one is S99, one for S990, S is the initial letter of the English word silver (silver), on behalf of silver. The content is divided into 999, 990 and 925.
Expanded Information:
Sterling Silver Applications
Sterling silver is a beautiful silvery-white metal that is very malleable, and has the highest electrical conductivity and silver bullion heat transfer of any metal.
Silver is commonly used to make extremely sensitive components of physical instruments, all kinds of automated devices, rockets, submarines, computers, nuclear devices, and communication systems, all of which have a large number of contact points made of silver. Each contact has to work millions of times during its lifetime, and must be wear-resistant and reliable enough to withstand the rigors of the job, and silver is perfectly suited to meet all of these requirements.
If rare earth elements are added to silver, the performance is even better. With this kind of silver with rare earth elements made of contact points, life can be extended several times.
The most important compound of silver is silver nitrate. In medicine, aqueous solutions of silver nitrate are commonly used as eye drops.
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