What is the most expensive and best copper for incense burners?

This kind of stove is the most expensive and the best.

The incense burner is made of bronze, brass, red copper and miscellaneous copper. Among them, variegated copper is a unique handicraft in Yunnan, and its process is complicated. Its shape absorbs the fusion of Yunnan bronze and Central Plains culture, which is elegant, rich and shining. It is the best copper in incense burner making.

Moreover, because spot copper is processed from natural copper ore and raw materials are scarce, it is known as "one or two spot copper and one or two gold", and it is also the most expensive copper in incense burner production.