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Answer: orthochromatic
Answer	Crossword Clue
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

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a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: orthochromatic