[pure-silver] Re: chips in bottom of fixer bottle
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 15 May 2010 17:43:40 -0700
----- 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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