正色底片属于或关于对除了红色外所有颜色敏感并能将红色变成深灰色、蓝色和绿色变成浅灰色的胶片、胶盘或感光乳胶的

• Of or relating to a film, plate, or emulsion that is sensitive to all colors except red and renders red as dark gray and blue and green as light gray.