[pure-silver] Re: OT-- chroma list

Jobo warned against using bleach on their products,
esp. in the "tub" of the processor where algae tends
to grow.  Bleach makes their plastics brittle.   I use
the TC-1 for their tanks and reels after I notice them
getting a bit dirty looking and that works well.

I also use non-bleach liquid toilet bowl cleaner for a
lot of these kind of cleanings and in the tub of the
processor. Toilet bowl cleaner is just a bit less
toxic and for small things like the neck of a fixer
bottle it's more pleasant to work with.  Jobo's
processor cleaner was basically citric acid.
Eric Nelson
http://www.archival-photo.net


>      Plain household bleach should remove the fixer.
> Silver 
> can be removed by a dichromate or permanganate
> bleach, both 
> of which require sulfuric acid to make up. Some
> silver 
> deposits are very difficult to remove and must be
> scrubbed 
> off using something along the lines of a stiff
> toothbrush.
>      Mild silver stains can sometimes be removed by
> strong 
> Farmer's Reducer or by using a bleach made up of
> film 
> stength rapid fixer with about 15 grams per liter of
> Citric 
> acid added.
> 
> Kodak TC-1 Tray Cleaner
> Water                            1.0 liter
> Potassium bichromate            90.0 grams
> Sulfuric acid, concentrated     96.0 ml
> 
> The usual warning, add the acid slowly to the water
> to avoid 
> heating and splattering.
>   This solution can be re-used until it stops
> working.
> 
> Kodak TC-2 Tray Cleaner (Especially recommended for
> removal 
> of silver stains)
> Solution A
> Water                            1.0 liter
> Potassium Permanganate           5.0 grams
> Sulfuric Acid, concentrated     10.0 ml
> 
> Solution B
> Water                            1.0 liter
> Sodium Bisulfite                10.0 grams
> 
> Sodium Metabisulfite will do.
> 
> For use pour A into the tray and swirl around for a
> few 
> minutes. Then pour out and rinse with water. Then
> pour in 
> Solution B to remove the stain left by the
> Permanganate, 
> then pour out and wash thoroughly.
> 
> 
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx 
> 
>
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