[pure-silver] Re: chips in bottom of fixer bottle

  • From: harry kalish <hksvk@xxxxxxxxxxx>
  • To: <pure-silver@xxxxxxxxxxxxx>
  • Date: Sat, 15 May 2010 21:21:39 -0400

Marbles---my local Dollar store sells them---a decent size plastic bag of
them for a buck.


On 5/15/10 8:43 PM, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:

> 
> ----- Original Message -----
> From: "Janet Cull" <janetgcull@xxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Saturday, May 15, 2010 12:28 PM
> Subject: [pure-silver] Re: chips in bottom of fixer bottle
> 
> 
>> It's dark brown (so I can't see really well to the bottom)
>> plastic.  I  put hot water in and agitate it.  Yes,
>> they're very thin dark slivers  - presumably from the
>> bottom.  I don't know if they were safe lying  there, but
>> I've broken and stirred them up - or if tiny particles of
>> *that* were my trouble before.  If I had a way to get a
>> new one right  now I would just toss that bottle and start
>> over.  For now I'm holding  off on processing film.  I
>> don't want more gunk on my film.
>> 
>> I just wanted to know if that was unusual to find, if you
>> all  encountered that, or how you avoided it.
>> 
>      Its hard to know exactly what it is but likely its
> sulfided silver. You can try household bleach to remove it.
> Let the bleach soak for a few hours and wash out with hot
> water. If the bottle is such that you can't scrub the
> insides with a brush try marbles or steel shot. I have no
> idea where one obtains marbles these days but shot should
> not be too difficult to find.
>      The old standby for cleaning is "chromic acid" cleaner.
> This was the standard for cleaning laboratory glassware for
> generations.
> Kodak Tray Cleaner TC-1
> Water                             1.0 liter
> Potassium dichromate             90.0 grams
> Sulfuric acid, concentrated      96.0 ml
> 
> Swirl this stuff around in the bottle for a time and rinse
> thoroughly with water. The cleaner can be re-used until it
> no longer works.
> 
>     Another cleaner which may work better for silver sulfide
> stains is the following. It can also be used on hands:
> 
> Kodak TC-3 Tray and Hand Cleaner
> Solution A
> Water                        1.0 liter
> Potassium permanganate       2.0 grams
> Sulfuric acid, concentrated  4.0 ml
> 
> Store this solution in a stoppered bottle away from the
> light.
> 
> Solution B
> Water                        1.0 liter
> Sodium bisulfate            30.0 grams
> Sodium sulfite, desiccated  30.0 grams
> 
> Both solutions can be used for several vessels but should be
> discarded after use.
> 
> An acid fixing solution can be used in place of Solution B
> but it is important to wash thoroughly to eliminate the hypo
> from the tray or hands.
> 
> To clean trays" To remove stains due to silver, silver
> sulfide, and many dyes, pour a small quantity of Solution A
> into the vessel and allow to remain for a few minutes; rinse
> well and then replace with a similar volume of Solution B.
> Agitate so as to clear the brown stain completely, they wash
> thoroughly.
> 
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
> 
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