Copper engraving, also known as "etching engraving", "copper engraving", "copper etching engraving" and "etching engraving", is a kind of engraving. Refers to a kind of printmaking that is etched on a metal plate with corrosive liquid or directly carved with a needle or knife. It belongs to intaglio. Because the commonly used metal plate is copperplate, it is called copperplate. Copper engraving is elegant and solemn, and has always been regarded as a valuable art painting in the world. Masters of all ages have been keen on the artistic creation of copperplate prints. From Diu Lei in Germany, Rembrandt in the Netherlands, Goya in Spain, Manet, Monet, Sislan, Degas in French impressionism to Picasso and Matisse in modern times, all the masters have left beautiful copperplate works.