铜雕纯度较高的铅、锡、铜，再根据需要按一定比例配在一起铸造而成的。铜锈是随着周围环境的变化铜雕表面产生的化学反应。此反应会经历休眠期和生长期。铜锈的颜色以绿、蓝为主。存世时间短、保存较完好的铜雕表面多数都有"水银沁"或"黑漆古"等漂亮的皮壳。陈年自然锈蚀，其锈蚀有明显的层次，一般从外到内纵向分为锈土结合层、主体锈层、地子锈层。锈土结合层上常见锈蚀与地下环境中的附着物，如泥土或碳化后的草木屑等；在锈土结合层的下面有一层绿色或蓝色的结晶锈就是主体锈层；在主体锈层以下就是紧贴铜雕的黑或红褐色的氧化膜层，即地子锈层。这3层锈蚀次序分明、排列合理，有的铜雕没有锈土结合层，甚至没有主体锈层，但是决不能没有地子锈层，这对于分辨老锈新锈十分关键。而大多数仿古铜雕由于其经历的时间较短，通常只有一层浮锈，颜色单一、结构松散、附着较差，如果去掉浮锈会直接露出新鲜的铜体。 Copper carvings of high purity lead, tin, copper, and then according to the need according to a certain proportion to be cast together. Copper rust is a chemical reaction that occurs as the surrounding environment changes. This reaction will experience dormant periods and long periods of growth. The color of bronze is mainly green and blue. Most of the copper carvings with short time and preservation have "mercury bentham" or "black lacquered ancient". Aged natural rust, its rusting has a distinct layer, generally from the outside to the inner longitudinal is divided into the rust soil combining layer, the main rust layer, the ground subrust layer. The common rust and the immaterial of the underground environment, such as soil or carbonized grass, etc. A layer of green or blue crystals below the rust-earth bonding layer is the main rust layer; Below the main rust layer is the black or reddish-brown oxide film layer, known as the ground subrust layer. Clear and reasonable arrangement, the three layer corrosion order some tripod for no rust soil layer, even no body rust layer, but must not be no rust layer, it is critical for distinguishing the old new rust rust. However, most of the ancient bronze sculptures have only a single layer of rust due to their short experience. The color is single, the structure is loose, and the attachment is poor. If the rust is removed, the fresh copper body will be exposed.