[pure-silver] Re: Cleaning Nova Clips?

Hi Richard,

I soaked the clips in warm water with dish water detergent (I do not
have dental cleaning tablets, still got my own teeth..;-)..), and the
next day I could remove most if not all (except on one clip, perhaps
used for colour work) with a brush and tissue paper. I guess most of the
risdues were what NOVA refers to as "tar" whatever that may be.

NOVa does sell a product called Tarbuster:

http://www.novadarkroom.com/product/340/Nova_Tarbuster.html

"Specially formulated alkaline solution"


Thanks,

Cor


  

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: woensdag 25 februari 2009 7:22
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Cleaning Nova Clips?


----- Original Message -----
From: <C.Breukel@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, February 23, 2009 4:20 AM
Subject: [pure-silver] Cleaning Nova Clips?


Hi,

I have been using a Nova Quad vertical tank for processing
B&W paper. I
am very statisfied with this system as such. Now my clips
are getting a
bit dity, and I am experiencing some streaks of unfixed
emulsion
starting from the 2 punctures and/or between the 2 punctures
(made by
the nails in the clip).

Perhaps the one has to do with the other, so I want to clean
the clips
anyway.

Brushing in hot water helps, but not completely. Any tips on
a good
cleaning method for these clips?  Can a bleach be used (I
know you can
use the unit for colour work, so I assume that the clips can
stand some
bleach)

Thanks & best,

Cor

     Late on this. Can you see any residue on the clips? If
its silver you can remove it by using strong acid rapid
fixer with acetic acid added. This will bleach metallic
silver as well as halide. Because household bleach is
detremental to most plastics it should be used sparingly but
it will remove gelatin residue rapidly. Try brushing on a
diluted solution of the bleach and then wash. The old
standard cleaner was potassium dicromate acidified with
sulfuric acid. This is a very cleaner for glass and some
other materials and I have used it on plastic trays without
apparant damage. The cleaner can be reused even though it
will get dark and ugly looking. I think Kodak also
recommended a solution hot sodium carbonate for some types
of equipment, probably stainless steel but my Kodak lab book
is stuck away somewhere. I would be surprized if a solution
of laundry detergent in hot water and a stiff toothbrush
doesn't take off whatever is there.

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx


    

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