speed (speed@www.napc.com)
Wed, 06 Oct 1999 16:14:04 -0400
Are you pre washing? Are you rocking the drum or going in one
direction? What temperature? I'm running N31p with POTA for 15 min
at 27 C. and had the same problem when I didn't pre wash.
Speed
Cor Breukel 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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