Dan Koons (dkoons@pld.com)
Wed, 06 Oct 1999 12:29:42 -0500
Cor, could you have had any moisture in your tube when you loaded the
film? I have ruined some negs by not drying the drum;(
At 11:01 AM 10/6/99 +0200, you wrote:
>Bromide drag?
>
>This is a slightly off-topic question concerning processing of lith film
>for continuous in-camera negatives.
>
>I have used the LC1 developer, formulated by Dave Soemarko in PF #2 (a low
>on metol and HQ developer, high on sulphite, using acidic bisulphite to
>tame the lith film) and adapted it for in-camera negatives. I have used
>Freestyles APH lith film. My tests resulted in quite nice continuous tone
>negatives (at the expensive of film speed, I use 1 or 1.5 ASA...), when I
>used the following ratios: (A:B:water) 2:3:5
>
>Which is per litre (end concentrations):
>0.6 gr. Metol
>12 gr sodium sulphite
>0.6 gr. Hydroxyquinone
>3 gr. sodium bisulphite
>
>I used a JOBO processor with a print drum with special plastic inserts;
>these inserts make it possible for the developer to "reach" the back of
>the film, they also cause a lot of turbulence judging from the foam on top
>of the discarded solutions. For 2 sheets of 18 * 24 cm (7*9.5 inch) I use
>500ml of developer.
>
>The first series of negatives were quite promising, and printed nicely as
>silver gelatine contacts when using a grade O filter, they also printed ok
>as Kallitypes, but they could use some extra contrast/density (which isn't
>really a problem with Lith film..;-)..).
>
>My problem arouse when I made a further series: a couple of images with a
>lot of clear empty skies with flagpoles, a lamppost etc. All these objects
>exhibited a "smear"going up into the sky; a smear of added density on the
>negative; lighter when printed. I vaguely remember something about bromide
>drag; but I do not know what this exactly is.
>
>How is this caused, how do you recognize it, and how can I avoid it? I
>also thought this has something to do with exhaustion of the developer
>(not unlikely maybe), but why is this only happening on places where dark
>objects are next to light objects. I mean the JOBO is continuously mixing
>the developer.
>
>Any feedback appreciated
>
>Cor Breukel
>http://ruly70.medfac.leidenuniv.nl/~cor/cor.html
>
>
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