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orthochromatic PHOTO

orthochromatic film PHOTO

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English
Almost all modern photographic film is panchromatic, but some types are orthochromatic and are not sensitive to certain wavelengths of light.
en.wikipedia.org
One records the color red (via a dyed panchromatic film), and the other, blue (orthochromatic).
en.wikipedia.org
By the addition of erythrosine the emulsion could be made orthochromatic while some cyanine derivatives confer sensitivity to the whole visible spectrum making it panchromatic.
en.wikipedia.org
Monochrome film is usually panchromatic; orthochromatic has fallen out of use.
en.wikipedia.org

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