| Answer | Crossword Clue |
|---|---|
| orthochromatism | the state of being orthochromatic, of photographic film, sensitive to all colours except red |
| orthochromatic | (of black-and-white photographic film) Sensitive to all visible light except red. Orthochromatic film can therefore be handled in red light in the darkroom but does not produce black-and-white tones that correspond very closely to the colors seen by the eye |
| orthochromatic | of photographic film, sensitive to all colours except red |
| panchromatic | of photographic film, sensitive to all colours |
