In the days of the darkroom....

12 years 11 months ago #80087 by goli
I understand the reason for no lights.. but what was the reason for having a red light? Was it only to see? or did it help develop the film?


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12 years 11 months ago - 12 years 11 months ago #80111 by MLKstudios
Most film is "panchromatic". It can see all the colors in a rainbow. Once the film is processed, it was simply black and white and doesn't need to see colors anymore.

The paper we used (for black and white) is "orthochromatic" or not sensitive to red wavelengths (of light). So we could turn on a red light and were able to see what we were doing without fogging the paper.

Matthew :)

Matthew L Kees
MLK Studios Photography School
www.MLKstudios.com
[email protected]
"Every artist, was once an amateur"

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12 years 11 months ago #80115 by cod
The red "safelight" is for the photographer to be able to see what he's doing. Black and white papers generally are sensitive to higher frequencies of light and not very sensitive to lower red frequencies, so low levels of red light allow the developer to see what he's doing without significantly affecting the exposure on the paper when making b&w prints. Undeveloped film handling, however, has to behandled in complete darkness. Similarly, colour print paper is sensitive to all colours so must be kept in darkness until the print is fixed. I believe there are some specific reddish lights that can be used with colour paper if they are of low enough power and kept far enough away from the print area, but I've never used them. In my darkroom days I loaded film and did colour prints in the dark, and used a typical red safelight for b&w printing.

Chris O'Donoghue
Winnipeg, Canada
codonoghue.prosite.com

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12 years 11 months ago - 12 years 11 months ago #80461 by Henry Peach
No light for film. Red light for BW prints. Really dim amber light for RA-4 color paper. The safelight is for the photographer's vision. There are colored filters in the enlarger that adjust the color of the light used in printing. Getting correct color in a photo requires the right filter combo. Variable contrast BW paper is sensitive to various colors of light, and can be used to lower or raise contrast.

Once I was locked in my darkroom with my hands full of sheets of 4x5 film I was tray developing. It was pitch black. Something began chewing loudly behind me. I just had to sit in the dark shuffling the film, and hoping it wasn't coming for me next. I never could figure out what it was or what it was eating when the lights came on. It happened several times over the course of a week, and then whatever it was moved on. :toocrazy:
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12 years 11 months ago #80465 by MLKstudios
No wonder you bring duct tape now!

:)

Matthew L Kees
MLK Studios Photography School
www.MLKstudios.com
[email protected]
"Every artist, was once an amateur"

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12 years 11 months ago #80515 by icepics
I bought some darkroom items as a lot and ended up w/some old photo paper - that expired in the 60s, even the 30s (which I've been experimenting with to do lumen or sun prints). Some of these indicate whether to use red or amber light for that particular paper.

With newer multigrade papers I'm not sure if it matters so much for basic black and white; I was using a darkroom at a local university that started phasing out that program (which is why I'm collecting items to set up my own darkroom) and I think it had an amber satelight in the part of the darkroom w/the print stations. So we could see and not run into each other going from the enlarger to the sink!

When I started out there taking a weeklong workshop we were learning how to develop film and were standing in the pitch dark passing a can opener to the next person so we could each pop open our film canisters. (Later I was like - can't the university spring for a couple more $1 can openers??)

Sharon
Photo Comments
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12 years 11 months ago - 12 years 11 months ago #80539 by effron

goli wrote: I understand the reason for no lights.. but what was the reason for having a red light? Was it only to see? or did it help develop the film?


Hell, I know I had a red light, but that was a long time ago....;)
The above are correct, only B&W printing, everything else in the complete dark.......

Why so serious?
Photo Comments
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12 years 11 months ago - 12 years 11 months ago #80557 by John Landolfi
:ohmy: :rofl: :rofl: great story , Matt.


Photo Comments
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12 years 11 months ago #80643 by Graflex 4x5
Hate to trample some toes here, but 'back in the day' there were orthochromatic films, mostly used for press work and you did use a red safelight at least 4 ft from the film. Dark rooms at the newspapers were busy places and you couldn't have a couple of guys stumbling around in a blacked out room.

Kodak stopped making their ortho films a while ago, but ADOX and Rolli are making film in 35 mm, 70 mm and 4 x 5 cut film. And if you can find a doctor or hospital that hasn't gone digital, X-ray films are ortho.

No matter how fast I go, there's always someone slower in front of me.
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12 years 11 months ago - 12 years 11 months ago #80969 by Henry Peach

Graflex 4x5 wrote: ...but 'back in the day' there were orthochromatic films...


Sure, there are always exceptions to the norm. Pyro developers use a dim green light to inspect film development. My darkroom safelights are mid-20th century Kodak brand models. They came with dozens of different filters.
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