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A little while ago I used some Ilford wetting agent that I had for a few years and had some fairly random drying marks. I guessed it had 'gone off' and used a new bottle of Tetenal Mirasol and no more marks. Wetting agent tends to last so long in terms of usage that I overlooked how long I had had it and so put the marks down to that.
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Originally Posted by Ian Grant
Ian, I am using distilled water and photo flo for the final rinse. I think I just may have been using too much photo-flo and it ran down the film and accumulated on the final frame. Is there a household acetic acid I can pick up at a local store to soak it in? I can't tell which side of the film it's on, like I said it appears to be IN the film
The active ingredient in distilled (white) vinegar is acetic acid.
Good advice, even on the emulsion side?
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Originally Posted by Ian Grant
Is it feasible to soak the film in white vinegar to attempt to remove the deposit?Quote:
Originally Posted by michaelbsc
Vinegar is dirt cheap where I live, and I imagine it isn't expensive anywhere.Quote:
Originally Posted by brian steinberger
So a couple of bucks for a bottle of vinegar is you don't happen to have it already in the kitchen, and cut it to 1+3 is where I would start. Not sure what concentration would be recommended to clean calcium stains. But 1+3 should be about 1-2% acetic acid for most grocery store brands.
Michael, excellent! I guess I was just a bit concerned about soaking a negative in vinegar! I will certainly give it a try, the negative is worthless to me in its current state. And the thing is, it's such a great image!Quote:
Originally Posted by michaelbsc
Just make sure you use distilled vinegar, not the cider vinegar.Quote:
Originally Posted by brian steinberger
Frankly, when I was a kid I used vinegar as a stop bath. What's the difference in food grade acetic acid in a bottle of vinegar and photo grade acetic acid from a chemical supply house? None that the film knows about.
The local druggist gave me the 1+3 proportion when I was trying to buy photo chemicals. In the tiny town I grew up in the drug store was where you bought any kind of chemicals except farm chemicals.
Stop bath is dilute acetic acid. I would probably mix some fresh for this operation, as opposed to risking some contaminant from a used batch. (And I suspect distilled white vinegar these days is pretty pure -- more industrial than food stuff.)
Would the stop bath need to be diluted more than normal?Quote:
Originally Posted by DWThomas