Historically, the materials used in production tools have been continuously improved, and it has a close relationship with the development of human society. Therefore, historians used the material of artifacts to mark historical periods, such as the Stone Age, the Bronze Age, and the Iron Age. Eight kinds of non-ferrous metals were clearly recognized and applied by humans by the end of the 17th century.
The Chinese nation has made significant contributions to the discovery and production of these non-ferrous metals (see Metallurgical History). After entering the 18th century, the rapid development of science and technology promoted the discovery of many new non-ferrous metals. Of the 64 non-ferrous metals mentioned above, 13 were discovered in the 18th century, except for the 8 types that were recognized before the 17th century. In the 19th century, 39 species were discovered. In the 20th century, four species were discovered.
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