Definitions for "Orthochromatic"
Black-and-white emulsions that are not equally sensitive to all colours of light. They are more sensitive to blue and green, but not sensitive to red light.
Term used to describe 'Black & White' emulsions that are not sensitive to red light, B&W printing papers are usually orthochromatic. (see Panchromatic)
Photographic surfaces sensitive to ultraviolet, blue, green, and yellow rays, but insensitive to red rays.
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