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Old 02-07-2008, 09:55 AM   #9 (permalink)
Alessandro Serrao
 
Join Date: Oct 2004
Location: Rome, Italy
Posts: 467
Quote:
Originally Posted by amuderick View Post
2) I'm leaning towards a permanganate / bisulfate bleach vs. dichromate. I hear this really softens the emulsion but that colder temperatures can help. Can I slowly cool the film after being washed from the 1st developer before I put it in the bleach? The bleach would be cooled as well. I'm thinking about 55-60F. I would increase the bleach time by about 2x.
Imho, you made the right choice.
The only caveat is to use half the permanganate strenght of what's suggested. For example I've found using 250mg permanganate per 36exp roll quite sufficient without stressing the emulsion.

Right: the temperature should be mantained at 20°C or lower (max 18°C) and constant (within 0.5°C) during all steps.

But the most important thing is to use HALF permanganate strenght and not doubling the time.
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