Mulcaster: It used to be 99%, but now 92.5-99% are all qualified! Yin Su: 92.5% -99% are articles without other materials. Pure silver: 92.5-99% is pure silver. There is no concept of pure silver in the terminology. It is a general term for silver! Miao Yin: Most of them are less than 60%. Tattoo: Snow Silver 93.5%. Macarthur: Also known as black silver, it is to melt the mixture of silver and sulfur on silver ornaments to form a glassy coating. The coating of black silver is loose and black, which is in sharp contrast with the smooth silvery white of silver and produces special visual effects. Due to special anti-aging treatment, black and silver jewelry not only does not change color for a long time, but also has greatly enhanced surface hardness. The unique texture and color make this kind of jewelry rough and simple. Conceptually, she is 925 sterling silver, which is just a special name for a special craft. It is called "Mulcaster" mainly because it comes from an ingenious Thai masterpiece. Makasite inlaid gems are different from Tibetan silver and Nepalese silver. Marcasite is dominated by crystal clear lapis lazuli and garnet, and red and black are the main colors of marcasite gems. Pure silver: 92.5% silver +7.5% copper alloy, which is an internationally recognized standard for pure silver. Platinum plating is generally used to prevent yellowing and blackening due to oxidation or vulcanization. 925 silver without platinum plating is called "plain silver". In the jewelry industry, 925 pure silver or enough silver is directly processed into finished silver ornaments, and there is no need to plate platinum, colored gold and other alloys, and 925 pure silver does not need to be inlaid with other jewels and jade. S990 sterling silver jewelry is called "plain silver". Pure silver oxidizes easily in the air, which leads to the blackening of silver ornaments. The market is gradually replaced by platinum-plated and colored gold-plated silver ornaments. Miao Yin: Miao Yin is also called Yunnan Silver, not pure silver. It contains silver. White copper etc. The silver content is about 40%. Mainly distributed in the southeast of Guizhou Province, such as Silversmith Village near Qianhu Miao Village, Kaili City, Guizhou Province. The Miao silver ornaments in Yinjiang Village are mainly made of white copper. After electroplating, waxing and coloring, Guizhou Miao silver ornaments with distinctive characteristics were formed. Tattoo: Also known as foot print, it is the legal standard of silver in Qing Dynasty. The Qing court stipulated that the payment of money and grain should be based on tattoos, and other silver must be converted according to standards. The purity of granular silver is .935374. Compared with modern China, the fineness of precious metal silver is lower, so it needs to be nourished when it is converted into tattooed silver. Snowflake silver: it is first-class silver, and it is also the title of ordinary people for silver!