[pure-silver] Re: Fixer
- From: harry kalish <hksvk@xxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 01 Jan 2010 19:01:16 -0500
In the first place, the small piece of roomlight exposed film leader was not
pre-wetted, and the second piece of roomlight exposed film leader also was
not pre-wetted. The concentrated fixer from the factory did not clear the
film, but the working solution of Hypam (1+4) cleared film within 30
seconds. Ilford gives the pH as 5.0-5.5, so I guess it is an acid fixer.
With added hardener, the pH is 4.5-5.0.
I am convinced that the ammonium thiosulphate needs to be in aquous
solution, ie., diluted, in order to fix film, quite likely for the reason
tritisol states below.
Thanks for all the help with this.
Harry.
On 1/1/10 1:57 PM, "titrisol" <titrisol@xxxxxxxxx> wrote:
> my wild guess is that there si not enough water in the concentrate for the
> silver salts to get into the complex.
> maybe (???) Ilford is using an agent to extend life of the concentrate that
> keeps the thiosulfate salts stable and diminished the water activity?
>
>
> --- On Thu, 12/31/09, Speedy <speedgraphic@xxxxxxxxxxx> wrote:
>>
>> From: Speedy <speedgraphic@xxxxxxxxxxx>
>> Subject: [pure-silver] Re: Fixer
>> To: pure-silver@xxxxxxxxxxxxx
>> Date: Thursday, December 31, 2009, 3:35 PM
>>
>> This is purely a wild guess.
>>
>> I am not at all familiar with this fixer. The only products available
>> to me locally come from the not so great yellow father...
>>
>> My wild guess is that if this is a hardening fixer that the higher
>> concentrated
>> stock solution might have gont straight to hardening before the film was
>> fixed?
>>
>> Again - just a wild guess...
>>
>> Speedy
>>
>>> > From: dickburk@xxxxxxxxxxxxx
>>> > To: pure-silver@xxxxxxxxxxxxx
>>> > Subject: [pure-silver] Re: Fixer
>>> > Date: Wed, 30 Dec 2009 21:15:20 -0800
>>> >
>>> >
>>> > ----- Original Message -----
>>> > From: "harry kalish" <hksvk@xxxxxxxxxxx>
>>> > To: <pure-silver@xxxxxxxxxxxxx>
>>> > Sent: Wednesday, December 30, 2009 6:41 PM
>>> > Subject: [pure-silver] Fixer
>>> >
>>> >
>>>> > > Last week I poured fixer into the daylight tank and at the
>>>> > > same began a
>>>> > > clearing test. When the roomlight exposed film scrap did
>>>> > > not clear after two
>>>> > > minutes, I discovered that I had grabbed for the
>>>> > > concentrated Ilford Hypam
>>>> > > instead of the working solution. That seemed strange to
>>>> > > me, so I prepared a
>>>> > > working solution with the stuff that would not clear film.
>>>> > > It cleared film
>>>> > > within 30 seconds when diluted 1+4.
>>>> > >
>>>> > > Just curious if anyone is feeling like making sense this.
>>>> > >
>>>> > > Thanks,
>>>> > > Harry.
>>> >
>>> > I can't make sense of it. The concentrate should clear
>>> > the film quickly. Its not good to use on a regular basis
>>> > because it can bleach the image. Now, having said that I
>>> > must add the qualification that I am not a chemist and there
>>> > could well be something I don't know here.
>>> >
>>> > --
>>> > Richard Knoppow
>>> > Los Angeles, CA, USA
>>> > dickburk@xxxxxxxxxxxxx
>>> >
>>> >
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