[pure-silver] Re: tank and tray cleaner
- From: Matthew Gaylen <mgaylen@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 21 Sep 2004 14:58:09 -0500
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
>>> =====================================================================
>>> ==
>>> ======================================
>>> To unsubscribe from this list, go to www.freelists.org and logon to
>>> your account (the same e-mail address and password you set-up when
>>> you
>>> subscribed,) and unsubscribe from there.
>>>
>>
>>
> =======================================================================
> ======================================
>> To unsubscribe from this list, go to www.freelists.org and logon to
>> your
>> account (the same e-mail address and password you set-up when you
>> subscribed,) and unsubscribe from there.
>>
>
>
> --
> --
> Edward C. Zimmermann, Basis Systeme netzwerk, Munich
> Office Leo (R&D):
> Leopoldstrasse 53-55, D-80802 Munich,
> Federal Republic of Germany
>
>
> =======================================================================
> ======================================
> To unsubscribe from this list, go to www.freelists.org and logon to
> your account (the same e-mail address and password you set-up when you
> subscribed,) and unsubscribe from there.
>
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
