‘Bronze’ is not only used to refer to the typical alloy of copper and tin which often also contains lead or zinc. It is also used to refer to other metals, including brass, which is an alloy of copper and zinc. In any case, bronze is a strong and enduring material that can capture fine and complex details within a casting mold. This dark reddish-brown metal has been used in European countries since antiquity. It has been used to create tools, weapons, sculptures, and decorative works. These applications continued throughout the medieval period. In the 15th century, for example, there was a deliberate revival of the forms and techniques of ancient Greece and Rome. How is bronze cast? There are two basic ways: sand casting, a simple technique that uses molds made of compact, fine sand; and lost-wax casting, which, on the other hand, is a complex process using wax models. Furthermore, there is also the “direct” method, in which the original wax model is used, and, therefore, destroyed; finally, there is also the “indirect” method, in which plaster molds are taken from the original wax, which makes them suitable to be reused many times.