From: Burkhardt Kiegeland (burkhardt@einsundsein.org)
Date: 09/03/01-01:27:30 PM Z
Here is the Kodak S6 formula for removing of stain:
Stock solution A:
Potassium parmanganate 5.2g
Cold water to make 1l
The permanganate has to be dissolved completely to avoid spots on the neg.
Stock solution B:
Cold water 500ml
Sodium chloride 75g
Sulfuric acid, conc. 16ml
Cold water to make 1l
Caution: Never put the water into the acid, it will boil up!
Stock solution C:
Sodium bisulfite,
1% soilution, this means 1g for 100ml water
1. Harden the film (2-3min) in a hardener solution like 5-10% glyoxal
2. Wash for 5min
3. Bleach in equal amounts of A and B for 3-4min,
the mix is of short shelf life
4. After bleaching put negative in solution C until
all stain is removed
5. Wash thoroughly
6. redevelop under 100W bulb in a non staining developer of low alkali
like D72 dilution 1:2. D76 does no good because of itīs high sulfite
and low alkali which would dissolve the silver image
I did use this formula successful with some overstained Pyro negs a couple
of times.
Burkhardt Kiegeland
www.lotusviewcamerea.at
> Von: Don Bryant <dsbryant@telocity.com>
> Antworten an: alt-photo-process-l@skyway.usask.ca
> Datum: Sun, 02 Sep 2001 21:25:08 -0400
> An: alt-photo-process-l@skyway.usask.ca
> Betreff: Re: POP choices
>
> Richard,
>
>> A permanganate
>> bleach should remove the stain.
>
> Any recommended recepiets for permangante bleaches? I need to strip some
> pyro stain from negatives.
>
> Thanks,
>
> Don Bryant
>
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