[pure-silver] Re: WORKING OR STOCK? Darkroom Chemistry... Question
- From: "bobkiss @caribsurf.com" <bobkiss@xxxxxxxxxxxxx>
- To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 3 Mar 2015 10:20:32 -0400
DEAR ERIC,
I have an excuse! Since 2011 I have had four surgeries, three of
which were under general anesthesia, and all of which required significant
regimens of pain killers both for post op pain and for physiotherapy. They
are known to affect short term memory. This is my story and I am sticking
to it! LOL!!!
CHEERS!
BOB
On Tue, Mar 3, 2015 at 10:07 AM, Eric Nelson <dmarc-noreply@xxxxxxxxxxxxx>
wrote:
> TBH I don’t recall. My formula, which I got from this list, was always
> stock when mixed. Richard had posted it here originally some time ago and
> that’s, where I recall, getting it from. I’d saved the emails for future
> reference but they seem to have less detail than needed or I remembered.
> So I just searched them on the list archive.
>
>
> https://www.freelists.org/post/pure-silver/puresilverRe-Kodak-Wash-Aid-Patent-Re-FORMULA-KODAK-HYPO-CLEAR
> https://www.freelists.org/post/pure-silver/FORMULA-KODAK-HYPO-CLEAR,6
>
> Hey Bob you were part of this discussion! Must be something besides my
> lack of darkroom time that caused my memory lapse. :)
> e
>
>
>
>
> On Mar 3, 2015, at 8:36 PM, bobkiss @caribsurf.com wrote:
>
> DEAR ERIC,
> Is your formula below for a working soln or a stock soln of Hypoclear?
> CHEERS!
> BOB
>
> On Tue, Mar 3, 2015 at 3:03 AM, Eric Nelson <dmarc-noreply@xxxxxxxxxxxxx>
> wrote:
>
>> I’ll save you the trouble. :)
>>
>> From Jerry
>> "Distilled water (50°C) .............. 750 ml
>> Sodium sulfite (anhy) ............... 100 g
>> Sodium bisulfite .................... 25.0 g
>> EDTA, Na4 ........................... 2.0 g
>> Sodium citrate ...................... 5.0 g
>> Distilled water to make ............. 1.0 l
>>
>>
>> And from your post from ‘07:
>>
>> The target pH of Kodak wash aid is 7.0. The formula given in the patent
>> is:
>>
>> Sodium Sulfite 20 grams
>>
>> Sodium Bisulfite 5 grams
>>
>> EDTA Na4 0.5 grams
>>
>> Water to make 1 liter
>>
>> Working solution.
>>
>> The MSDS for the commercial product shows that it also contains Sodium
>> Citrate in an amount similar to the EDTA Na4 but, of course, does not give
>> the actual amount of any of the ingredients, only ranges.
>>
>>
>>
>> The patent is USP 2,860,978”
>>
>> --------------------------------------------------------------------------------------------------------------
>> I have no digital version of this formula and cannot remember the HCA
>> formula I used despite having made it for years. Shows what 3 years out of
>> the dark will do to you!
>>
>> Eric
>>
>> On Mar 3, 2015, at 1:33 PM, `Richard Knoppow wrote:
>>
>> I have to look up the formula for wash aid because I am drawing a blank
>> on it right now but its sodium sulfite neutralized with sodium
>> metabisulfite, the Kodak version has two sequestering agents in it mostly
>> to prevent sludging from aluminum products from alum harderners and also to
>> sequester minerals in the wash water.
>>
>>
>
>
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