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orthochromatic

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orthochromatic

Photographic film or paper of decreased sensitivity, which can be processed with a red safelight. Using it, blue objects appear lighter and red ones darker because of increased blue sensitivity.
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Holm was pointing out the differences in shading between orthochromatic and panchromatic film, but I think the corollary is "old photos may be staged so they could fib a little too".
Lakota Women by Whispering Wind
10) Martha Rosler points out that many early landscape photographs were double-exposed or double-printed to render clouds in the sky because the orthochromatic emulsions of the era were incapable of achieving results where clouds and landscape were both correctly exposed at once.
Photographs: whence veracity? by Shapter, Michael / Afterimage
This is referred to as panchromatic film and is used today for all except special applications where orthochromatic film has advantages.
A bit of history--film--back then by Patti, Tony / PSA Journal
 
 
 
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