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.
Type of emulsion which is sensitive to visible blue and green light, but not to red.
A black and white film or photographic emulsion that is sensitive to all colours of the spectrum except red and orange. Used for special reprographic processes.
The emulsion silver component spectrally photo sensitive to blue, green, and yellow frequencies.
See color sensitive, note.
Any light sensitive surfaces that are not sensitive to red.
Photographic materials insensitive to red light but recording ultraviolet, blue, green and yellow light.
Photographic and lithographic films which are insensitive to red but sensitive to ultraviolet, blue, green and yellow areas of the spectrum.
or "Ortho" - (1) Representing correctly the relations of colors as found in a photographic subject. (2) A photographic emulsion sensitive to all visible colors except red - i.e. an ortho film is sensitive to blue and green light.
Relating to, or producing tone values of light and shade in a photograph that correspond to natural tones. Also, sensitive to all colors except red.
Photographic surfaces that are insensitive to red but sensitive to ultraviolet, blue, green and yellow rays.
Orthochromatic refers to any spectrum of light that is devoid of red light.
