When bronze is cast in the foundry the natural colour is light brown, like milky coffee. To obtain the almost mahogany colour favoured by the company, the sculpture has to be treated with various acids that are fired into the surface under intense heat. The technique is rather similar to an artist painting a picture and building up the colours until achieving the required tone.
The finished design is then coated in wax to preserve this look. It can be handled and polished in this state, but of course, if the surface is severely scratched in any cleaning process the wax will be removed and the surface damaged. We would suggest using a dry paint brush to remove dust from time to time. It’s lustre, or patina, will improve over time.