[pure-silver] Re: My old film : Part 2 results
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 19 Dec 2006 15:14:25 -0800
----- Original Message -----
From: "Georges Giralt" <georges.giralt@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, December 19, 2006 6:08 AM
Subject: [pure-silver] My old film : Part 2 results
Hi All !
So, I've made contact prints of my AgfaPan 400 film
expired in 1974...
They're not bad. A little low on contrast, but nothing VC
paper can't handle.
One of the main drawbacks are FB+F density which is around
1.0 (.84 for the less
dense neg, 1,05 for the densest) This is not too high
given I've souped the negs
in Rodinal 1+25 as per the instructions sheet found in the
boxes.
The subject was a flower vase on a whithe backgroup lit
with a north facing
window. On this area, the density is about 2.17 for the
least dense and 2.5 for
the densest neg. this give a range of 1.45 ~ 1.33
depending on the neg.
Now my question : Do you think it is possible to reduce
FB+F using benzotriazol
and if yes, how ?
Thanks a lot for your help and Merry Christmas to all !
--
Benzotriazole will reduce the fog but may not improve
matters any. If the fog it uniform it mainly reduces the
effective speed of the film. If the film was exposed in the
past the anti-fog may destroy some of the latent image.
Oxidation will also destroy some of the latent image so an
anti-fog agent my be counterproductive. Where the film is
unexposed the anti-fog will help reduce or eliminate
background fog but at the expense of some speed. I've used
plain Potassium bromide on some quite old Plus-X sheet film
which was quite foggy without it but very usable with it.
Speed was reduced to about EI-50. Contrast was about normal.
I have some Agfa APX-100 sheet film of about the same age
which is uselessly fogged despite the bromide. I have not
tried it yet with Benzotriazole. Benzotriazole in general is
a more effective anti-fog than bromide and effects both film
speed and latent image less. The relative effectiveness of
both agents depends on the pH of the developer.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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