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Old 21st February 2009, 08:24 PM
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Default Pinholes in negatives

I'm sure I've seen others mention this subject before but I've Googled the problem but the results just came up with Pinhole cameras etc....

I've been getting very small holes in my negatives and I havent got a clue why?
I've been using Foma 100 developed in Rodinal followed by Ilfostop and Rapid Fix for the dilutions and recommened times by Ilford

Can anyone tell me why this is happening?
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Old 21st February 2009, 08:28 PM
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Mike, are they literally holes or just clear areas of film?
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Old 21st February 2009, 08:31 PM
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Often caused by stop bath reacting with developer, depending on developer, and causing gas which blows a hole in the emulsion. Stop bath should be no stronger than 1.5% at most and infact 0.5% is probably strong enough to kill development pretty quick. So try reduced strength of stop bath. i.e. dilute 3 times more than you do currently so if it was 1:100 then use it at 1:300
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Old 21st February 2009, 08:38 PM
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I had the some problem with some foma 400, dev in rodinal, and could'nt understand it,and put done to a problem withthe film, it only happened on some film, and only on a few negs, but then I tried aph09 and it stopped, I have deved many fomas in aph09 with no problems,then recently I put a foma though rodinal and the pinholes were back,I can only assume it is something to do with rodinal, but I don't know what, Richard
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Old 21st February 2009, 08:42 PM
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Mike, If its of any help I use one of these pens to spot clear areas in my LF negatives. They are light fast and acid free. At 0.05mm they are very fine. Much easier to deal with a white spot then a black one on the print.

They are also excellent for writing a title and signing on the print margin.
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Last edited by Trevor Crone; 21st February 2009 at 08:46 PM. Reason: additional material
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Old 21st February 2009, 08:42 PM
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I thought of stop bath, reduced the dilution, same problem, used plain water as stop bath, same problem, only stopped when I changed dev, never happened on o9ther film though Richard
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Old 21st February 2009, 08:48 PM
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Trevor, after looking at them closely I can see that they are just clear areas of film. Could this be a dust problem? I clean my darkroom once a week and always use compressed air before I load new film into holders.

I've rescued this neg from the bin to show you the extent of the problem.
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Old 21st February 2009, 08:57 PM
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Mike, I would have thought Richard has hit upon the problem and that its a compatability problem with the developer and film. I had problems with 4x5 Fuji Across and PMK pyro and when I changed developer all was fine.

Before you rush to a conclusion however I think you should try a different developer with Foma 100.
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Old 22nd February 2009, 07:08 AM
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I'II pick up some ID11 today and see if that solves the problem.

I have been thinking of changing from Foma 100, its cheap n cheerful and has been great while I've been learning LF but I'm going to try either Delta 100 or FP4+, I just cant decide which?
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Old 22nd February 2009, 07:52 AM
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Quote:
Originally Posted by Mike Meal View Post
I'II pick up some ID11 today and see if that solves the problem.

I have been thinking of changing from Foma 100, its cheap n cheerful and has been great while I've been learning LF but I'm going to try either Delta 100 or FP4+, I just cant decide which?
I've just brought a stock of Foma to try instead of my usual Delta stock.
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