[rollei_list] [rollei_list] Re: was : Agfa Scala, now : home-made B&W slides in 120 revisited
- From: "claude.eichel" <claude.eichel@xxxxxxxxxxx>
- To: "rollei_list" <rollei_list@xxxxxxxxxxxxx>
- Date: Sun, 5 Jun 2005 18:44:49 +0200
I made 4 tests with FP4+ (2 rolls and 2 sheet films) using the Agfa formula.
The "soup" seems too strong for roll films black borders of the film are washed
out but the formula gives nice results on sheet films (6 minutes for FP4+
overexposed of 1,5 step)
Regards
Claude
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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