[pure-silver] Re: tank and tray cleaner
- From: "Edward C. Zimmermann" <edz@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 21 Sep 2004 21:08:44 +0200
Quoting Matthew Gaylen <mgaylen@xxxxxxx>:
> that was the recipe I had. How many grams would be more appropriate?
Its typically, I think, 90g per liter in the Kodak formula... But....
I have some commerical cleaner sold by Tetenal. According to its label
the concentrate for the cleaner is 5-15% Sulferic acid and 10-25% Sodium
Dichromate. Its neutralizer is listed as sulfite. The concentrates are
mixed 1+24 so 1 liter of working (re-usable) cleaner is less than 1%
Sodium Dichromate and less than 25% of 15% Sulferic acid--- if I'm not
too tired. So its, indeed, here something like under 10g leading one
to think that your recipe, while less chrome than the standard chromic
acid cleaner, is still fine..
> On Sep 21, 2004, at 8:31 AM, Richard Knoppow wrote:
>
> >
> >
> > -----Original Message-----
> > From: Matthew Gaylen <mgaylen@xxxxxxx>
> > Sent: Sep 21, 2004 6:07 AM
> > To: pure-silver@xxxxxxxxxxxxx
> > Subject: [pure-silver] Re: tank and tray cleaner
> >
> > Turns out you can purchase sulphuric acid from some folks without a
> > hazmat charge where some folks must charge an extra $20. And some folks
> > require a DEA registration. I went so far as to leave a message with
> > the field office in Chicago--but they never called me back.
> >
> > Anyway, I have about 3 lifetime supplies of tank and tray cleaner
> > consisting of 8 grams potassium dichromate mixed with 96 ml sulphuric
> > acid and 900 ml distilled water.
> >
> > Kills developer tray stains on contact.
> >
> > Contact me off list if you want a liter.
> >
> > Best,
> >
> > joe suburbs the post modern hyper rural sub urban anti hero and
> > vertiginous surrealist
> >
> > Only 8 grams of dichromate?
> >
> >
> >
> > Richard Knoppow
> > dickburk@xxxxxxxxxxxxx
> > Los Angeles, CA, USA
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>
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--
--
Edward C. Zimmermann, Basis Systeme netzwerk, Munich
Office Leo (R&D):
Leopoldstrasse 53-55, D-80802 Munich,
Federal Republic of Germany
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