The silver plated layer is easy to polish, with strong reflective power and good heat conduction, conduction and welding properties. The silver coating was first used in decoration. In the electronics industry, communication configuration and instrument and instrument manufacturing, silver plating is generally accepted to eliminate the resistance of metal parts and improve the welding ability of metal. In addition, the metal reflector in searchlight and other reflectors also needs silver plating. Because the silver atom is easy to spread and slip along the material appearance, the silver whisker is easily produced in the moist atmosphere, so the silver coating should not be used in the printed circuit board. The silver plating fluid used now is intense cyanide bath.