[rollei_list] Re: RPA, Efke 25, fixer with hardener?
----- Original Message ----- From: "Mark Rabiner" <mark@xxxxxxxxxxxxxxxx> 
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, March 31, 2009 12:36 AM
Subject: [rollei_list] Re: RPA, Efke 25, fixer with hardener? 



That's nice to know Richard thanks.
In the Kodak chemistry book I'd page through time after time I'd mix up many 
of their developers;
But none of their fix's. Maybe one.
I never even had the joy of using pure sodium Thiosulfate, (hypo or fix) 
As my final fix bath.

I was tuned into the whole time rapid fix and Kodaks brand
Which is Ammonium Thiosulfate as you may have just written. 
No hardener.
And two bath not only for my prints but also for my negs.
The second bath once I started also using it for negs had the added benefit of not only really fixing your negs so I felt fully confident but getting the pink stuff out if I happen to be using Kodak tab grain films. Tmax 100, 
400 or P3200.


Mark William Rabiner
AFAIK Kodak published only one formula for a "rapid" fixer. This used sodium thiosulfate plus an ammonium salt to form ammonium thiosulfate in solution. Ammonium thiosulfate is short lived in powsder form so its usually sold as a liquid concentrate. Rapid fixers can be made using standard formulas but substituting ammonium thiosulfate at about the same equivalent weight as for _anhydrous_ sodium thiosulfate. 

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