一、前言我国年产镜片约一千四百万平方米,用硝酸银还原制镜法(旧法),年耗白银近五十吨。为了节约白银,1976年以来,开始推广真空镀铝新工艺,现已普及全国,仅湖南1982年就节省白银4.02吨。这两种 I. Introduction China’s annual output of about 14 million square meters of lenses, with silver nitrate reduction mirror method (the old method), the consumption of silver nearly 50 tons. In order to save silver, since 1976, began to promote vacuum aluminum new technology, is now universal throughout the country, only in Hunan in 1982 to save 4.02 tons of silver. These two