Old Japan Showa 49 Education Committee Commemorative Sterling Silver Cup

Old Japan Showa 49 Education Committee Commemorative Sterling Silver Cup This is an old piece that will inevitably have scratches and bumps. It can accept re-subscription. There is a mark on the bottom and it can be used normally. What is the difference between 925 sterling silver and 999 sterling silver? Sterling silver jewelry is divided into 925 sterling silver or 999 sterling silver, which means that the Silver content is 92.5% or 99.9%. Of course, there are also products with other composition ratios. 925 represents the purity of Silver, which is the highest purity of silverware, just like the purity of 999 gold. Because 999 Silver is too soft and easy to oxidize, it is easy to bend and deform due to impact. It is necessary to add alloys to sterling silver to increase the hardness to withstand multiple processing. In 1851, Tiffany & Co. launched jewelry with a Silver content of 92.5%, adding 7.5% to sterling silver. % alloy, the perfect ratio was developed to make silver jewelry reach the most moderate hardness. Therefore, 92.5% has become an internationally recognized silver jewelry standard, also known as Sterling, and also has the word silver. Generally speaking, 925 sterling silver is not easy to be allergic, but it still depends on each individual physique. Can silver jewelry be used for drug testing? According to my own experience, Silver chopsticks will gradually turn black after touching a preserved egg or special garlic soy sauce paste, that is, some sulfides and Silver will undergo chemical changes, and a layer of black Silver sulfide will be formed on the surface. Human skin secretions also contain a little sulfide, which will also make silver jewelry black! Yes, yes, but this is normal.