Gold plating is a decorative process and one of the commonly used words. Originally, it refers to plating a thin layer of gold on the surface of an object. Later, it was also used to describe people who went to an environment for further study or exercise just for the sake of fame. Gold plating can be divided into two categories: one is homogeneous gold plating; The second is gold plating of heterogeneous materials. Carbon disulfide is the earliest brightener for silver plating, which was put forward by Milword and Lyons in the patent published in 1847. It is still in use today, but it is slightly modified. Silver plating is cheaper than gold plating, and has high conductivity, light reflectivity and chemical stability to organic acids and bases, so it is widely used than gold plating. In the early days, it was mainly used in decorations and tableware, and recently it has been more and more used in airplanes and electronic products.