铜镜表面的铜皮附着层及其科学考察

今在多家藏品中见有一种外表包裹了”铜皮”的镜 ,铜皮较薄 ,常为 0 2毫米～ 0 4毫米 ,致密地与器体粘连着 ,往往覆盖了器体整个表面 ;其不但肉眼可见 ,而且可用机械方式剥离下来。这种镜有两个较为明显的特点 :一是多见于北方 ,南方很少看到 ;二是其外表覆有一层厚厚的绿锈。我们曾对多枚标本进行过扫描电镜能谱分析和金相分析 ,可知此铜皮较纯 ,或合金化程度较低 ,显示了一种与铸态不同的组织。从多方面情况看 ,我们推测 ,此铜皮应是镜体在自然状态下被氧化。水解后 ,又重新还原。附集而形成的。

Some bronze mirrors are wrapped in “copper sheet”.The copper sheet with 0 2-0 4mm.thickness is often covered the all surface of the mirror.It can be visible to the naked eye and peel off by the mechanical means.The kind of mirrors has two distinct characters.One is that most of the mirrors are discovered in the North. The other is that the thick green rust is covered the surface of the mirror.By analyzing some samples,we learn that the copper sheet are often pure or not in high alloy state,so we infer that after the oxidation and hydrolysis of the mirror body,the body is reduced again and formed the copper sheet.