As an important part of chemical instruments, crucibles are liquids for melting and refining metals, as well as for solid-liquid heating and reaction vessels. It is the basis to ensure the smooth progress of chemical reactions. Historically, crucibles were originally made of clay, and one of the earliest uses of platinum was also to make crucibles. But with the development of preparation technology, crucibles can now be made of any material that can melt or change its contents.​