A number of different surface finishes can be applied to the completed bronze. The most common being chemical patination. This is the application of a variety of chemicals either cold, or hot (using a blow torch), which react with the copper in the casting to create many different surface colours. This process mimics the natural effects of weathering, but at a greatly accelerated rate.
Colours can range from black/brown/green to white, or even blue, or any combination of colours. A good patina will work in sympathy with the sculpture, enhancing the form and surface, contributing to the overall feel of the piece.
Alternatively, a piece may be polished or lacquered or, perhaps even painted, according to the wishes of the artist.