光学工艺──平面抛光和检验李志超上一讲所述磨砂完成之后即可进入下一步抛光工序。现行抛光工艺是牛顿发明的，要点是利用沥青盘和红粉。红粉就是氧化铁粉。现在还有白粉，即氧化林粉，价格高，业余不必用。如无光学加工专用红粉，颜料店卖的铁红粉可以代用，用时装奶瓶... Optical Technology ─ ─ plane polishing and inspection Li Zhichao said after the completion of the matte finish to the next step of the polishing process. The current polishing process is invented by Newton, the point is to use asphalt tray and red powder. Pink is iron oxide powder. Now there are white flour, that is, oxidized forest flour, high prices, amateur do not have to use. If there is no optical processing special red powder, pigment shop selling iron powder can be used, with fashion bottle ...