[pure-silver] Re: Old film advice ...
- From: Georges Giralt <georges.giralt@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 17 Dec 2006 17:42:42 +0100
Richard Knoppow a écrit :
----- Original Message ----- From: "Georges Giralt"
<georges.giralt@xxxxxxx>
To: "Pure Silver" <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, December 15, 2006 4:31 AM
Subject: [pure-silver] Old film advice ...
Hello !
I've been given a bunch of 4x5 sheet film :
Ilford HP4
....................................................
The film condition will depend a lot on how its been stored. Heat is
the enemy. If the film was frozen it will be nearly like new. If
refrigerated its likely to be usable. Otherwise it may have become quite
foggy. The chemical reactions in the emulsion that take place before the
film was coated continue slowly after coating despite chemicals being
added to stop it. The result is fog and other degradations. Heat tends
to accelerate these effects.
If the packages were opened there may be further effects from
oxidation or from sulphides in the air.
You really have to test a film from each container separately. Fog can
be suppressed by adding a solution of Benzotriazole to the developer.
Benzotriazole is more effective against age fog than Potassium Bromide
and reduces film speed less. However, it will not cure really bad age fog.
The test film should be exposed and developed normally. The resulting
negative will tell you what changes must be made or if the film is
beyond practical use. The slower film is more likely to have survived
than the faster stuff.
.............................................
So this morning, I loaded a Grafmatic with AgfaPAN 400 and set my camera
in my kitchen in front of a flower vase. I took the six pictures from
ISO 400 down to IE 50. with a mix of natural and artificial light (the
kitchen tungsten lamp, 60W) as the weather is dark and rainy today, and
used my Komura 210 mm f/6.3 lens.
Back in the lab, as the leaflet suggests Rodinal 1+25, I ran all the 6
sheets in a Jobo 2521 and 2509N in Rodinal 1+25 manual agitation (1.450
l chemistry. It makes for the exercise I often miss...)
The negs are out and drying. Unfortunately, the frame counter in the
Grafmatic gave four #2 frames, one #1 and one #6... So identification
will be quite hard. As far as i can tell, FB+F is really high, but this
can come from the 1+25 Rodinal) and the flowers seems to be quite good.
There seems to be no such huge grain I was fearing. So I'll ran the negs
into contacts, tomorrow and let you know.
Thanks to those who answered ! It was great fun !
P.S. I'll do some ZS test this week if time permit...I'm quite busy
these times
--
Ce message est constitué d'au moins 50 % d'électrons recyclés.
S'il vous plaît, aidez nous à conserver nos ressources,
recyclez vos électrons !
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