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Most modern black-and-white films are panchromatic, which add sensitivity to red light, unlike orthochromatic emulsions, which are sensitive to only blue and green. Panchromatic films have a reduced sensitivity to blue light, compared to orthochromatic films. [2]: 22
In black-and-white photographic film there is usually one layer of silver salts. When the exposed grains are developed, the silver salts are converted to metallic silver, which blocks light and appears as the black part of the film negative. Color film has at least three sensitive layers.
The gelatin silver print is the most commonly used chemical process in black-and-white photography, and is the fundamental chemical process for modern analog color photography. As such, films and printing papers available for analog photography rarely rely on any other chemical process to record an image. A suspension of silver salts in gelatin ...
A panchromatic emulsion is a type of photographic emulsion that is sensitive to all wavelengths of visible light, and produces a monochrome photograph—typically black and white. Most modern commercially available film is panchromatic, and the technology is usually contrasted with earlier methods that cannot register all wavelengths ...
Although color processing is more complex and temperature-sensitive than black-and-white processing, the wide availability of commercial color processing and scarcity of service for black-and-white prompted the design of some black-and-white films which are processed in exactly the same way as standard color film.
The expense of color film as compared to black-and-white and the difficulty of using it with indoor lighting combined to delay its widespread adoption by amateurs. In 1950, black-and-white snapshots were still the norm. By 1960, color was much more common but still tended to be reserved for travel photos and special occasions.
A record of the color content in black and white was thereby created and could be reconstituted by projecting the film through an identical filter. The three colored stripes (red, green and blue-violet) of the filter had to be precisely oriented parallel to the film length.
General purpose instant color or black and white film. As with Fujifilm's Instax film, various frame styles are available. Netherlands: 107x 88mm Polaroid: 600 film: 2015-N/A: 640: Instant: Print: General purpose instant color or black and white film. Various frame styles. Netherlands: 107x 88mm Polaroid: SX-70 film: 2013-N/A: 160: Instant: Print