Purchase method:
1, look at the color
Look at the color (also known as look at the face file) test: the higher the purity, the whiter the silver, and the face file is delicate, even, shiny and polished. If lead is contained, the tidal flowers emitted by the noodle stand are blue-gray; If it contains copper, the surface file will be rough and rotten and feel dry. Although silver oxide has "black rust" on its surface, its color is black and bright, while lead, tin and copper are dull and dull.
Step 2 consider
The density of silver is slightly higher than that of ordinary metals. Generally speaking, "aluminum is light, silver is heavy, and copper is not light or heavy." So we can preliminarily judge whether it is silver by weighing. If the jewelry is large and light, it can be preliminarily judged that the jewelry belongs to other metals.
3, check the hardness
The hardness of silver is lower than that of copper but higher than that of lead and tin. So use a pin to lightly scratch the surface of the object to test. If the needle slips, it is difficult to leave traces on the surface, which can be judged as copper ornaments. If it is lead-tin texture, the trace is obvious; If the object has traces but is not obvious, it can be preliminarily judged as silver jewelry. Pure white silver jewelry, pulled by hand, will be deformed when folded.