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。

Lead, tin, copper and bronze with high purity, according to the need according to the certain proportion together cast. The two with chemical reaction to generate change the environment around the bronze surface. The reaction goes through a period of dormancy and growth. Two color to green and blue. Number of short time, save more intact bronze surface most have "Mercury Qin" or "Heiqigu" beautiful skin. Vintage natural corrosion, the corrosion has obvious level, generally from the outside to the inside is divided vertically into soil with rust rust layer, layer, the main sub rust layer. The rust layer soil with common corrosion and underground environment attachments, such as clay or carbonized vegetation scraps in the rust layer; soil with below a layer of green or blue crystalline rust is the main rust layer; in the oxide film layer is close to the main rust layer below bronze black or red brown, i.e. between the rust layer. Clearly, the 3 layer corrosion order is reasonable, no rust layer soil with some bronze, not even the main rust layer, but not the child never rust layer, the new resolution is the key of old rust rust. While most antique bronze because of its experience in a relatively short time, usually only one layer of rust, single color, loose structure and poor adhesion, if removed rust will directly expose fresh copper body.