[pure-silver] Re: tank and tray cleaner
- From: Matthew Gaylen <mgaylen@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 21 Sep 2004 15:12:56 -0500
"one drop..."
"fatal burns..."
Gulp!
Is it just me, or does it strike you that you wouldn't want to get on
Jerry's bad side?
--
On Sep 21, 2004, at 3:04 PM, Koch, Gerald wrote:
> The classic laboratory cleaning solution is made by adding potassium
> dichromate
> to conc sulfuric acid. What you get is chromium trioxide which is
> what chews up
> any organic material on the dirty glassware. Really nasty stuff, one
> drop taken
> internally can cause fatal burns of the esophagus.
>
> Jerry
>
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx
> [mailto:pure-silver-bounce@xxxxxxxxxxxxx]On Behalf Of Matthew Gaylen
> Sent: Tuesday, September 21, 2004 3:58 PM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: tank and tray cleaner
>
>
> Just my observation... knowing there are 6.023*10^23 pages of
> information out there I don't know about chemistry...
>
> ...but I can't imagine dumping 93 grams of potassium dichromate into a
> liter of sulphuric acid... kaboom!
>
> I measured the heat generated by dumping 8 grams into a 1:10 dilution
> of distilled water/sulphuric acid at greater than 120-degrees F and it
> stayed pretty darn warm for quite some time in an open container.
>
> No children allowed!
>
> Now, I know why the recipe I had advised against adding the dichromate
> directly to the sulphuric acid (at least I think I do) and recommended
> diluting the sulfuric acid first and then adding the dichromate.
>
> Yours (wearing Nyplex gloves AND the Photo-formulary apron),
>
> --
> joe suburbs the post modern hyper rural sub urban anti hero and
> vertiginous surrealist
>
> P.S. thanks for the definition of 1-Normal. That's the kind of
> information that makes photography even more fun.
>
> For those of you who are familiar with the film, "Young Frankenstein,"
> I'll just say that especially in light of our recent discussion about
> list transmogrification, most of us are less 1-Normal and more towards
> "Abby" Normal.
>
>
> On Sep 21, 2004, at 2:08 PM, Edward C. Zimmermann wrote:
>
>> 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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>>>> subscribed,) and unsubscribe from there.
>>>>
>>>
>>>
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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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>
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