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Learned something today |
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07-16-2011
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#1
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Striving
ChrisN is offline
Join Date: Apr 2005
Location: Canberra
Posts: 4,246
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Learned something today
I've been trialling some different developers, including some semi-stand routines, and have had trouble with uneven development, especially streaks associated with the sprocket holes - often called "bromide drag".
Well some of them are associated with the lack of inversion, and some were not what they seemed! Here's two scans of the same negative.
 
In this case the actual problem was fixer exhaustion - I'd lost track of the number of rolls fixed. Fresh fixer removed the streaks. There is still some underlying unevenness in the developing, but the fresh fixer gave me a usable neg. More traps for young players! 
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Chris
"The mission of photography is to explain man to man and each to himself. And that is the most complicated thing on earth."
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Last edited by ChrisN : 07-16-2011 at 03:19.
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07-16-2011
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#2
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... likes film.
maddoc is offline
Join Date: Dec 2006
Location: 調布市
Age: 47
Posts: 6,467
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Thanks Chris for posting this valuable information ! I have never thought about this possibility yet.
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07-16-2011
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#3
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Moderator
rover is offline
Join Date: Jul 2003
Location: Connecticut
Age: 47
Posts: 13,855
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Only 8:30am and I learned something new already. Now what am I going to do the rest of the day?  |
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07-16-2011
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#4
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Registered User
Tom hicks is offline
Join Date: Aug 2007
Location: Dallas Texas
Age: 55
Posts: 637
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Yes , great info for those of us that have just begun .
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07-16-2011
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#5
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Registered User
SciAggie is offline
Join Date: Dec 2010
Location: Texas
Age: 51
Posts: 775
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Great information - thanks! What made you think of fixer?
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07-16-2011
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#6
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eclipse
robklurfield is offline
Join Date: Mar 2009
Location: New Jersey, USA
Age: 53
Posts: 14,948
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I had the same problem. Took a couple of ruined rolls to realize it doesn't pay to be stingy with replacing fixer. Problem solved.
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07-16-2011
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#7
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May contain traces of nut
rxmd is offline
Join Date: Apr 2006
Location: Kyrgyzstan
Posts: 6,044
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Quote:
Originally Posted by robklurfield
Took a couple of ruined rolls to realize it doesn't pay to be stingy with replacing fixer.
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Indeed it doesn't. Fixer is dirt cheap anyway.
Using water or acetic acid stop bath helps against fixer exhauption, too.
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Bing! You're hypnotized!
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07-16-2011
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#8
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Temporary upside down.
skibeerr is offline
Join Date: Apr 2007
Location: Melbourne Vic
Posts: 827
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There is the Edwal hypo check. A small bottle gives you a few hundred tests for 10,5 euro.
Especially useful when fixing whet prints as you only see the bad fixing when the print turns grey.
http://www.macodirect.de/edwal-hypo-...ter-p-282.html |
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07-16-2011
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#9
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Registered User
Vics is offline
Join Date: Sep 2006
Location: California, USA
Posts: 2,353
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+one for Hypo Check. Works great
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Vic
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07-16-2011
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#10
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Registered User
FrankS is offline
Join Date: Aug 2004
Location: Great White North
Age: 56
Posts: 17,154
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It would be interesting for those of us with "ruined" film, supposedly due to bromide drag, to try refixing them. This would be worthwhile if anyone has an especially important negative that has this defect.
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“Believe nothing, no matter where you read it or who has said it, not even if I have said it, unless it agrees with your own reason and your own common sense.” – quote
I myself am made entirely of faults, stitched together with good intentions. -quote
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07-16-2011
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#11
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Registered User
Chinasaur is offline
Join Date: Feb 2011
Posts: 411
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N00bie question: How does fixer exhaustion contribute to making those striations in the negative? They seem very defined and delineated.
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Hexar RF, Yashica CCN, Yashica CC, Yashica GX & Yashica Minister, Olympus PEN EE-3, Olympus 35 DC, Canon A-1, Sony a850, Sony a700, Nikon D70, and a crapload of cheap ass Russian lenses I don't know what to do with since I can't ask Brian to shim them cause he don't do that anymore and so now I'm stuck with a whole crapload of cheap ass Russian lenses I don't know what to do with....
"Shut up and just shoot the damn thing..."
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07-16-2011
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#12
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Registered User
FrankS is offline
Join Date: Aug 2004
Location: Great White North
Age: 56
Posts: 17,154
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It has to do with chemical activity and exhaustion in those localized areas of the film. Sprocket holes are an opportunity for fresh chemical to flow over the localized film surface to a greater extent than other areas. There is more replenishment of exhausted chemicals with fresh chemicals. This results in uneven chemical action.
__________________
“Believe nothing, no matter where you read it or who has said it, not even if I have said it, unless it agrees with your own reason and your own common sense.” – quote
I myself am made entirely of faults, stitched together with good intentions. -quote
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07-16-2011
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#13
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Registered User
tlitody is offline
Join Date: May 2010
Location: Sceptred Isle
Posts: 1,807
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Quote:
Originally Posted by FrankS
It would be interesting for those of us with "ruined" film, supposedly due to bromide drag, to try refixing them. This would be worthwhile if anyone has an especially important negative that has this defect.
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I don't think that's bromide drag. It's surge marks from inverting too slowly so that developer flows through sprocket holes causing extra development where it flows over film.
When I invert I use parabolic motion curve like a ball being thrown from one hand to the other as in juggling. At the top of the curve the developer becomes weightless and at that point I invert the tank quite quickly. The developer then just falls to the bottom of the tank rather than flowing through sprocket holes.
Last edited by tlitody : 07-16-2011 at 09:45.
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07-16-2011
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#14
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Registered User
FrankS is offline
Join Date: Aug 2004
Location: Great White North
Age: 56
Posts: 17,154
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Quote:
Originally Posted by tlitody
I don't think that's bromide drag. It's surge marks from inverting too slowly so that developer flows through sprocket holes causing extra development where it flows over film.
When I invert I use parabolic motion curve like a ball being thrown from one hand to the other as in juggling. At the top of the curve the developer becomes weightless and at that point I invert the tank quite quickly. The developer then just falls to the bottom of the tank rather than flowing through sprocket holes.
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Right. But then how do you explain the original post?
__________________
“Believe nothing, no matter where you read it or who has said it, not even if I have said it, unless it agrees with your own reason and your own common sense.” – quote
I myself am made entirely of faults, stitched together with good intentions. -quote
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07-16-2011
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#15
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Registered User
tlitody is offline
Join Date: May 2010
Location: Sceptred Isle
Posts: 1,807
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Quote:
Originally Posted by FrankS
Right. But then how do you explain the original post?
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Exhausted fixer but those surge marks are still there albeit much less obvious. |
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