[pure-silver] Re: Fixer Stain Removal

Richard
I used the wrong word with 'stains'. What I mean is the white hardened remains of dried fixer. 





Regards



Ralph W. Lambrecht

http://www.darkroomagic.com
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On Nov 09, 2009, at 04:39, Richard Knoppow wrote:
----- Original Message ----- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx > 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, November 08, 2009 4:21 PM
Subject: [pure-silver] Fixer Stain Removal



What is the latest wisdom on removing fixer stains? I've tried a 50%
citric acid solution with limited success but like to get something
more 'agressive'.





Regards



Ralph W. Lambrecht
Describe the stains. If they are silver stains you may have success by using fresh acid rapid fixer with added citric acid, about 15 grams per liter. This is a mild solvent for metallic silver. For sulfide stains I think one has to resort to stronger bleaches like Kodak TC-3. 

Solution A
Water                            1.0 liter
Potassium permanganate           2.0 grams
Sulfuric acid (concentrated)     4.0 ml

Store in a stoppered bottle away from light.

Solution B
Water                            1.0 liter
Sodium bisulfite                30.0 grams
Sodium sulfite, desiccated      30.0 grams
It appears that the sodium metabisulfite of commerce is the same substance as called sodium bisulfite in Kodak formulas.
To use treat stains with a small amount of Solution A, then rince well and treat with solution B. Then wash. 

I will look at some other sources for clothes specific stain removers.

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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