It is an alloy that has Copper and Zinc as components and therefore is a noble metal.
It has as its property the durability due to its patina due to its patina (bronze tones or aged gold) and the aesthetic due to its golden tone.
It is possible the stabilization of the oxidation still in its initial stage through varnish specially developed for this purpose blocking the aggressive agents and the formation of patina for a periods of 05 years.