[rollei_list] Re: RPA, Efke 25, fixer with hardener?

  • From: Mark Rabiner <mark@xxxxxxxxxxxxxxxx>
  • To: <rollei_list@xxxxxxxxxxxxx>
  • Date: Tue, 31 Mar 2009 02:42:23 -0400

Richard I've used hardener in the developer; Before using them in the fix.
Sodium sulfate. 
Not sodium sulfite but sulfate is a hardener you can put in many developers
certainly MQ and PQ's to enable such tray development activity.
Its in one of my main Kodak darkroom chemistry books.
Worked like a charm.
It might lower the PH but the constant way in which you're interleaving in
the tray makes for fast development times.

Developing sheet film in racks you don't need any hardener of any kind not
in your fix nor your developer in my experience - which is not small.
Several hundred sheets - not big either. The racks just protect them as
you'd expect.

Full metal rackets.



Mark William Rabiner



> From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
> Reply-To: <rollei_list@xxxxxxxxxxxxx>
> Date: Mon, 30 Mar 2009 18:53:06 -0700
> To: <rollei_list@xxxxxxxxxxxxx>
> Subject: [rollei_list] Re: RPA, Efke 25, fixer with hardener?
> 
> 
> ----- Original Message -----
> From: "Carlos Manuel Freaza" <cmfreaza@xxxxxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Monday, March 30, 2009 12:26 PM
> Subject: [rollei_list] RPA, Efke 25, fixer with hardener?
> 
> 
> 
> A friend of mine is sending me a box of Efke 25 film sheets
> 6.5cm x 9, this is the exact size for the Rollei plates
> adapter.I have read the emulsion is soft too much while wet
> and then Efke suggests a fixer with hardener. I have
> available to buy a Kodak rapid fixer with hardener, is it
> necessary really? or could I handle the wet film sheet with
> care avoiding to buy a new fixer?. BTW I have never used the
> Rollei plates adapter yet, I have never developed film
> sheets yet (I have a Domi-Plan tank)and I have never used
> hardener, modern emulsions don't need hardener, older
> ones -Efke 25 uses an Addox formula- needed one often.
> TIA
> 
> Carlos
> 
>      Keep in mind that the hardener works only during the
> latter part of the fixing and during washing. Unless you are
> going to wash in warm water the hardener should not be
> necessary. By warm I mean in excess of about 75F. According
> to one chemist the hardener has no effect on the dry
> emulsion.
> 
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
> 
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