Tips for buying silverware
The silverware itself is very plastic and the shape is varied, so the popularity is also a necessity. 925 silver made jewelry best When the reporter conducted a market survey, some silver jewellery was found to be 925 silver, while some used 990 silver. Which one is the symbol of sterling silver jewelry? Wang Chunsheng, senior engineer of the National Jewelry Quality Supervision and Inspection Center The reporter explained that the national standard stipulates that 990 silver, 925 silver and 800 silver can be used for silver jewelry. The silverware that is said now is generally 925 silver. The 925 silver jewellery is a 92.5% pure silver with a 7.5% alloy added to the alloy to improve the gloss, brightness and hardness of the silver. And since Tiffany introduced the first silver jewelry with a silver content of 92.5% in 1851, 925 silver became popular, so 925 is currently used as a standard for identifying whether it is sterling silver. The 925 silver jewellery has a very beautiful metallic luster after polishing, and it also has a certain hardness. It can be set with precious stones and made into high-end jewellery. 990 pure silver, which is 99% pure silver and 1% alloy, because of its insufficient hardness, it is easy to deform after being made into jewelry, so few manufacturers use it for jewelry, and 990 silver is used in industry. widely. 800 silver is a 20% pure silver with 20% alloy added. The lower the purity of silver, the easier it is to oxidize, so manufacturers rarely use it for jewelry. The silverware that passes the test is reassuring Silver raw materials are very cheap, only 2 yuan / gram, but there are some manufacturers in the silver jewelry with cadmium, iron, copper and other cheaper metals. Cadmium is harmful to the human body and is not allowed to be incorporated into jewelry according to regulations. Wang Gong told this reporter that the manufacturer is mainly doing this to reduce costs and achieve higher profits. The copper wire is mainly used in the silver lock to make the middle support frame. According to the state regulations, the support frame in the silver lock should also be silver. Since the copper wire is hidden inside the silver lock, the consumer can't see it at all, and only destroy it when it is tested to see its true face. Only after waiting for a long time, the inside of the copper rust seeps out, consumers can find out. Although silver ornaments are not expensive, they are also true and false. Although this phenomenon is not universal, consumers should still have some methods to identify silver jewelry. Wang Gong told reporters that consumers can check the physical properties of silver when they purchase it. The usual test methods are: Look at the color: the higher the purity, the whiter the silver, the uniform appearance of the jewelry surface, and the touch. If it contains lead, the jewelry will appear blue-gray; if it contains copper, the surface of the jewelry will appear rough and the color will not be moisturized. 掂 Weight: The density of silver is slightly larger than that of common metals. Generally speaking, “aluminum is light, silver is heavy, copper is not light and not heavy.†Therefore, the weight can make a preliminary judgment on whether it is silver. If the jewelry is large in size and light in weight, it can be preliminarily judged that the jewelry belongs to other metals. Check the hardness: the hardness of silver is lower than that of copper, and it is more than lead and tin. It can be tested in places where the pins are not negligent. If the needle is slippery and the surface is difficult to leave traces, it can be judged as copper jewelry; if it is lead, In the case of tin texture, the traces are obvious and prominent; if the real object has traces and is not obvious, it can be initially judged as silver jewelry. Listening to the rhyme: The sterling silver jewelry has a sound, no elasticity, and the sound is "åŸå“’åŸå“’". The lower the color, the lower the sound, and the higher the sound, the more rhythm; if it is copper, the sound is higher and sharper, the rhythm is short and short; if it is lead or tin, the sound is dull and short. , no stretch. At the same time, Wang Gong also told reporters that it is not an ideal method to test silverware solely by the physical properties and experience of silver. Only by destroying the silverware can the chemical method be used to test the true and false of the silverware. However, this is something that consumers cannot achieve. In addition to mastering some basic inspection knowledge, consumers should pay attention to whether there are any relevant certificates, certificates and certificates in the purchase of silverware. Only silver jewelry that has been tested by the testing agency can be bought with confidence. In addition, the silver content of silver jewellery must be accurate. If consumers buy it, they should check whether there is "S925" on the jewellery. "S" is the first letter of the English word for silver, and "925" is the sign for sterling silver. As long as there is "S925", you can ensure that you are buying genuine sterling silver jewelry. Pay special attention to whether the fasteners can be fastened and secure when purchased. When you buy a silver chain, flatten it to see if the chain is knotted or bent. The price of silver jewelry is determined by the content of precious metals, structural design and craftsmanship, so the most important criterion for choosing silver is to see if you like it. Ladies Fabric,Dyed Yard Twill Fabric,African Print Chiffon Fabric,100% Polyester Chiffon Fabric Shaoxing Fang's Imp & Exp Co., Ltd , https://www.sxfangstex.com