[pure-silver] Re: tank and tray cleaner
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 21 Sep 2004 13:15:26 -0700
----- Original Message -----
From: "Matthew Gaylen" <mgaylen@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, September 21, 2004 11:29 AM
Subject: [pure-silver] Re: tank and tray cleaner
> that was the recipe I had. How many grams would be more
> appropriate?
>
> 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
The formula for Kodak TC-1 is typical.
Sulfuric Acid, concentrated 90.0 ml
Potassium dichromate 96.0 grams
Water to make 1.0 liter
Other versions specify 90 grams of dichromate so I suspect
the amounts are not critical.
The cleaner can be diluted 1:1 for some purposes and can be
reused many times. It probably can be reused until it
doesn't bleach out the stains well.
Another tray/equipment cleaner is Kodak TC-2, especially
recommended for removing silver stains.
Kodak TC-2
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
To use pour solution A into the tray and allow to remain for
a few minutes with agitation.
Then rinse with water and replace with Solution B until the
stain is removed. Then wash thoroughly in water.
To dissolve the Permanganate use a small volume of very hot
water (180F or 82C). Stir vigorously until throroughly
dissolved. Then dilute the volume with cold water.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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