[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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