Silver is a silvery-white precious metal with stable properties, high thermal and electrical conductivity, not easily corroded by acids and bases, soft and ductile, with strong moulding properties. For consumers, they need to understand some silver products related knowledge, grasp the simple and feasible test method, which can help to identify the preliminary silver products to be purchased. The classification of silver products on the market According to its colour, silver jewellery can be classified from high to low as sterling silver, grain silver and coloured silver. According to the processing method can be divided...