Orthochromatic film (Ortho film): Photographic material insensitive to red lihgt but sensitive to green and vlue lights.It is the standard type of phototypesetting film and origination film.

• 正色菲林:对红光没有感应，只对绿光和蓝光有感应的照相材料。它是照相排字和印前操作用的标准菲林。