The silver chemical symbol Ag, derived from the Latin name of the silver, Argentum, means "light, bright." The original meaning of silver is "metal with (value) close to gold."
Natural silver is mostly alloyed with gold, mercury, antimony, copper or platinum, and natural gold is almost always alloyed with a small amount of silver. Amber gold, known in ancient China, is called ELECTRUM in English and is a natural gold-silver alloy containing about 20% silver.
In ancient times, humans had an understanding of silver. Like gold, silver is a precious metal with a long history of application. It has a history of more than 4,000 years. Chinese archaeologists have discovered the "gold and silver fault" (a pattern inlaid with gold and silver) embedded in the surface of the appliance from the unearthed bronzes of the Spring and Autumn Period. The silverware unearthed from the ancient tombs of the Han Dynasty has been very beautiful. Due to the unique characteristics of silver, people have given it a dual value of money and decoration. In ancient times, the greatest use of silver was to act as a medium for commodity exchange - currency.
925 sterling silver is also known as "925 International Standard Silver". Jewelry made of 925 silver has better hardness and toughness. At the same time, silver is also the world's most popular currency in the ancient times. It is not only amber, but it is also often used as a jewelry inlay.
100% pure silver itself is not high in hardness, soft in texture, and due to strong chemical reaction, it is easy to darken and darken, so it cannot be made into jewellery in pure form, but is often doped with other components (copper, zinc, nickel, etc.). ). The standard content is more than 92.5% of silver. It is what we call 925 international standard silver. Its hardness is better than that of pure silver. It has strong ductility (after gold only). It can be processed into more elaborate styles. It is hypoallergenic. Material, sensitive skin can be worn with confidence.
Due to the characteristics of silver itself, 100% of the silver texture is very soft, it is easy to scratch, and it is not suitable for more and more elaborate process requirements, as well as the increasingly rich and exaggerated modeling requirements of modern fashion accessories. In addition, 100% silver is prone to discoloration and tarnishing. Therefore, in 1851, after Tiffany introduced the first silverware with 92.5% silver, 925 silver quickly became the main force of silver jewelry and became Internationally, whether silver is the standard for sterling silver.
The silver that has just been unearthed has a silver-white metallic luster. It is easy to produce a layer of black oxide when exposed to the air for a long time, and the surface gloss is lost. This is an oxidation phenomenon of silver, but it can be cleaned.
Silver is an active metal that reacts easily with sulfur in the air to blacken the silver. Therefore, wear as little as possible in contact with air, and should not be worn in places where chemical gas is concentrated. After exposure to sulphur soap, it must be dried immediately. Chloride in sweat also has an effect on silver. Therefore, in order to prevent oxidation, the jewelry silver is also plated with a thin layer of platinum.
With the addition of 7.5% alloy, silver has the ideal hardness, toughness, brightness and gloss, and oxidation resistance. Moreover, it can be inlaid with various gems. From then on, the silver jewellery is popular in the world with its bright color, chic style and exquisite craftsmanship.
Silver is an unstable metal that will turn yellow due to external factors. There is no way to prevent it from changing in the world. Platinum (palladium, rhodium) on 925 silver can effectively isolate the contact of 925 silver with the outside air. This platinum effect not only makes the silver look more beautiful, but also makes this outdated currency more practical. Platinum-plated silverware can only last for 4-12 months, depending on how you care.
After wearing silver and amber for a long time, it can absorb the body's oil, the amber's rate of pulping and the oxidation rate of silver, in fact, is also the reaction of the human body. The rate of pulping and oxidation of acidic bodies usually makes them faster. Therefore, it can be said that sterling silver and amber are good partners for human health. It is also inevitable that these good friends will come together.
1.PEVA and EVA are both environmental protection materials, among which EVA is the best and most high-grade new environmental protection material - it is a food grade product, odorless, soft and smooth, good sag feeling, and has a certain degree of elasticity.
3. PVC has good transparency. Because the material itself will have flavor, it needs to add plasticizing agent, which is strong and durable, with good sag and general feel. The soft and hardness will change with the temperature change. If the temperature is high, it will be soft; otherwise, it will be hard. It is not an environmental protection product.
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