Copper bathtubs are antibacterial making them perfect bathroom fixture that is healthy and at the same time beautiful. The bathtubs are made of hammered copper using the technology utilized by Europeans before even discovering North America. What makes brand new copper bathtubs antique? The way it is made and finished. Instead of waiting a long time for copper to become dark in natural edging, producers from state of Michoacan located in central Mexico apply heat to speed up the process. It takes about four weeks to produce a single copper bathtub antique style.