First, put the silver bars and silver bars on the gas stove to burn red, and then put the red-hot silver bars and silver bars into cold water. Pure silver is white, and impure silver will turn black. This method can only identify whether the purity of silver reaches 99%, and can identify small pieces such as true and false bracelets. The melting point of pure silver is 960 degrees, which can be burned boldly. The fire at the gas burner can't melt the silver.

2. Inspection by the Bureau of Quality and Technical Supervision

The gold and jewelry testing department of the local quality and technical supervision bureau conducts instrument identification, inquires the telephone number of the local quality supervision bureau office, and then calls the location of the relevant testing department for face-to-face testing.

3. Observation method

Look at the color of silver: the higher the purity, the whiter the silver, and the jewelry surface looks even, shiny and polished. If it contains lead, the jewelry will appear bluish gray; If it contains copper, the surface of jewelry will be rough and the color will not be moist.

4. Weighing method

Weight of silver ornaments: 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." Therefore, it can be preliminarily judged 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.

5, specific hardness, hardness inspection

The hardness of silver is lower than that of copper, but higher than that of lead and tin, so it can be tested by marking jewelry in an inconspicuous place with a pin. If the needle slips, it is difficult to leave traces on the surface, which can be judged as copper jewelry; If it is made of lead and tin, the trace is obvious; If the object has traces but is not obvious, it can be preliminarily judged as silver jewelry.

6. Listen to sounds and rhythms

Hit the floor, a piece of sterling silver jewelry, no elasticity, issued a "bam bam" sound. The lower the color, the lower the sound, and the sharper and higher the rhyming sound; If it is made of copper, its sound is high and sharp, and its rhyme is short and short; If it is made of lead and tin, the sound of falling to the ground is dull, short and inelastic.