First of all, check the mark, according to the national standard "GB1187-8P", the silver content is not less than 925 称为 called 925 silver, silver 925 imprint; silver containing not less than 990 称 is called full silver, full silver mark Or hit the silver 990 mark. Secondly, the higher the purity, the whiter the silver, the finer the surface, the evener and brighter, and the touch. If it contains lead, the surface is blue-gray; if it is copper-containing, the surface is rough and dry. Although the oxidized silver has a "black rust" on the surface, its color is black and bright, and lead, tin and white copper have no luster. Since the density of silver is slightly larger than that of common metals, it is generally said: "Aluminum is light, silver is heavy, and copper is not light or heavy." Therefore, the weight can be judged whether it is silver or not. In addition, the hardness of silver is lower than that of copper, and it is larger than that of lead and tin. Therefore, it can be tested with a small pin to draw the surface of the object. If there is trace and it is not obvious, it can be initially judged as silver jewelry. For the common counterfeit silver on the market, counterfeit silver is generally made of white copper, lead, tin, aluminum, etc. It is characterized by: the appearance of white copper is grayish white, the mouth is brick gray, green rust; the lead is grayish blue. Color, soft, can be traced with nails; tin is silvery white, soft; aluminum is white gray, soft texture, light weight. Bengaline Fabric,Elasticity Bengaline Fabric,Dyed Bengaline Fabric,Woven Bengaline Fabric ZHE JIANG LUO RUI IMPORT CO.,LTD. , https://www.lrknitted.com
March 03, 2021