Identification of sterling silver

The first thing to check is that according to the national standard "GB1187-8P", the amount of silver is not less than 925 inches called 925 silver, silver 925 stamp; silver weighing not less than 990 feet of silver, full silver imprint , Or hit the silver 990 imprint.

Second, the higher the purity, the more white the silver, the surface is delicate, even bright, there are touches. If it contains lead, the surface has a grayish-gray color; if it contains copper, the surface roughness has a dry feeling. Although the oxidized silver has “black rust” on the surface, its color is black and bright, and lead, tin, and white copper are not glossy.

Since the density of silver is slightly larger than common metals, generally speaking: “Aluminium is light, silver is heavy, and copper is neither light nor heavy.” Therefore, the weight of a silver can make a preliminary judgment on whether it is silver. In addition, silver is lower in hardness than copper, and it is larger than lead and tin. Therefore, the surface of a real object can be tested by using a pin to make a test. If there is a trace and it is not so obvious, it can be initially determined as a silver jewelry.

For the counterfeit silver commonly found on the market, Manager Zhao said that counterfeit silver is generally made of white copper, lead, tin, aluminum, etc. Its characteristics are as follows: the appearance of white copper is gray, the mouth is gray brick, and green rust is generated; It is grayish blue, soft, and can be traced with nails; tin is silvery white, soft; aluminum is white-gray, soft texture, light weight.