[rollei_list] Re: was : Agfa Scala, now : home-made B&W slides in 120 revisited

  • From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Fri, 3 Jun 2005 09:09:25 -0300 (ART)

Hello Claude:
              Very interesting the work about B&W
slides processing, I have some questions:
1)You used a Jobo machine for the process, I'd like
try it manually (if I decide to try the process
really); can I agitate the first developer like during
a "normal" process?.-

2)Can I use a Rodinal or Rodinal Special developer +
sodium thiosulfate as first developer?

3)I never used sulphuric acid, I don't like it, of
course; is there no problem to measure and to handle
it using plastic elements?.

4)I guess I could use a different fixer (not
Tetenal),is it right?. It is necessary the harder
really?.-

5)I did not understand very well the way to expose
both film faces to a strong light; if the film is in
the reel, you can expose to the light one face only.

6)Is it possible to use a commercial bleaching product
like Farm (I think for E6 process).

Thank you very much in advance.

All the best
Carlos

 --- "claude.eichel" <claude.eichel@xxxxxxxxxxx>
escribió:

> Thank you for the precisions Richard. The times you
> indicates are quite similar to those given by
> Glafkides (4 to 5 minutes) so I'll begin with 5min.
> I allways fix the films (roll or sheet films) after
> the second developer. I read somewhere it was an
> option but I did'nt trust this.
> Claude Eichel
> Strasbourg France
> 
> 
> 
> > 
> > ----- Original Message ----- 
> > From: "claude.eichel" 
> > To: "rollei_list" 
> > Sent: Thursday, June 02, 2005 8:12 PM
> > Subject: [rollei_list] Re:[rollei_list] Re: was :
> Agfa 
> > Scala, now : home-made B&W slides in 120 revisited
> > 
> > 
> > >I am not a chemist either. It's funny to make
> tries and 
> > >"create" something.
> > > I'll try the Agfa recipe this evenning.
> > > Claude
> > >
> > I just did a comparison of the c.1940 Agfa formula
> with 
> > the current Kodak formula. There is less
> difference than 
> > you would suppose.
> > Now, there is a big difference between the
> recommended 
> > development times for the two. The Agfa
> instructions do not 
> > give a definite time but say between 4 and 6
> minutes at 68F 
> > (20C) for "current films", meaning c.1940. The
> somewhat 
> > milder Gevaert developer gives times for a few
> Gevaert and 
> > DuPont stocks of the time running between 6 to 8
> minutes. 
> > Now, Kodak indicates the development time should
> be about 2 
> > minutes at 68F. This is for machine processing
> with 
> > continuous agitation.
> > I note that neither the old instructions or
> Kodak's 
> > current one uses a stop bath. In fact Kodak
> cautions against 
> > using a stop bath. A wash step is used, for the
> machine the 
> > wash is 30 seconds at 68F. Agfa recommends a 10
> minute 
> > running water wash between first developer and
> bleach.
> > Modern films seem to develop quite a bit faster
> than those 
> > of the 1940's. This proabably accounts for part of
> the great 
> > decrease in development time but I also suspect
> the Kodak 
> > developer is more active even though both have
> about the 
> > same amount of hydroxide in them.
> > Again, a caution: If you must use light fogging
> for 
> > reversal the film must be fixed after the second 
> > development. This insures clear highlights and
> makes the 
> > image permanent. Washing shold be done as with
> normal B&W 
> > processing. If a fogging chemical is used, or if
> Sodium 
> > Sulfide is used for second development the final
> fixing bath 
> > is not necessary.
> > 
> > ---
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx 
> > 
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