Development of old film
dan...@online.no
anybodu happen to have a table showing the recomended developingtime i for
instance Rodinal developer ??
John M.E. Dancke
P.O.Box 98
N-4371 EGERSUND - Norway
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dan...@online.no
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Francis A. Miniter
Having just developed some rather old Kodak film - shot about 80 years ago, I
can offer some suggestions, though I cannot give you specifics. The film you
describe is probably a very slow panchromatic film. If you have a No. 3 dark
green Safelight, you can probably inspect it during development *very*
briefly. If it were orthochromatic, you could use a No. 1 red safelight.
If the film size is not 120, 620 or some other standard reel size, I would
recommend that you use 3 plastic window planter inserts as troughs. Get them
at least three feet long, and attach film clips to each end of the film to
keep it from curling. (Richard Knoppow gave me this advice and it works
well.)
There is a debate as to whether you should use an antifoggant/restrainer in
the developer or not. (See recent discussion in rec.photo.darkroom under
"Update on Unknown Ancient Kodak film Development.") I favor not using the
antifoggant.
You should figure that development times will be significantly extended from
those for modern emulsions, in part at least, because the film itself is
thicker. I extended mine about 35% and it was not enough. Probably, 100%
more is more like it. BUT, this is why you want to have the No. 3 safelight
to turn on about 2/3 of the way through the 2x development time, so that you
can judge how much more time is necessary.
When you first get the film in your hands in the dark, feel for how thick it
is compared to modern films. This will give you some idea of the amount of
extra time needed.
Good Luck.
Francis A. Miniter
Richard Knoppow
>I have to deleop an old Agfa Isopan ISS-film (about 40 years old) Dopes
>anybodu happen to have a table showing the recomended developingtime i for
>instance Rodinal developer ??
>
>John M.E. Dancke
>P.O.Box 98
>N-4371 EGERSUND - Norway
>----------------------------------------------------
>dan...@online.no
>----------------------------------------------------
>
>
>
The closest I can find is a listing for Isopan sheet film in an old
Photo-Lab-Index. This dates from 1943. Agfa and Ansco used the Isopan
name for a long time and its possible the emulsion was changed at some
point. It is described as a slow, fine grain, panchromatic film, the
Weston speed is given as 50, General Electric speed 125 which would
make it around ISO-80.
Developing times are given for Ansco/Agfa 17, which is similar to
D-76. I've found that Times for D-76 full strength and Rodinal at
1:25 are about the same for many films.
At 68F (20C) about 8 to 12 minutes, depending on desired contrast. I
am assuming this is exposed film.
Since the film is panchromatic it should not be devloped by
inspection although a dark green safelight can be used for a few
seconds after the developoment is half completed to check the
progress.
---
Richard Knoppow
Los Angeles, Ca.
dick...@ix.netcom.com
Alexander Selzer
> Developing times are given for Ansco/Agfa 17, which is similar to
> D-76.
Agfa 19. Agfa 17 is a bit different!
Alex
--
Alexander Selzer http://selzer.home.pages.de/
sel...@iname.com http://photokine.home.pages.de/
http://drf.home.pages.de/
Richard Knoppow
I can't find Agfa 19 in my references.
Agfa/Ansco 17 is
Water 750.0 ml
Metol 1.5 gm
Sodium Sulfite, dessicated 80.0 gm
Hydriqinone 3.0 gm
Borax, granular 3.0 gm
Potassium Bromide 0.5 gm
Water to make 1.0 liter
For comparison D-76 is:
Water 750.0 ml
Metol 2.0 gm
Sodium Sulfite, dessicated 100.0 gm
Hydroquinone 5.0 gm
Borax, granular 2.0 gm
Water to make 1.0 liter
The variation is probably not enough to make a real difference in
performance. It is ceratainly within the experimental variations
covered in the 1929 paper describing D-76.
According to that the small amount of bromide will have the effect
of increasing film speed slightly due to suppression of low level fog.
Agfa 19 may be a formula not given in US publications. Please post
it. I would also like to know if Agfa published some other formula
under the title of Agfa-17.
Alexander Selzer
> Agfa 19 may be a formula not given in US publications. Please post
> it.
Agfa 19 = ORWO 19 = Kodak D-76 = Ilford ID-11 = Calbe F19 =
http://home.pages.de/~selzer/PhotoRezepte/1.html#19 = ...