Re: Lith Printing Infrared Negatives

["Tim Rudman" <tim.rudman@xxxxxxxxxx>]

----- Original Message -----
From: Tala Brandeis <brandeis@xxxxxxxxxxx>
To: <infrared@xxxxx>
Sent: Thursday, December 09, 1999 4:06 PM
Subject: Re: Lith Printing Infrared Negatives


> > ------------------------------
> >
> > Date: Wed, 8 Dec 1999 04:24:15 -0000
> > From: "Tim Rudman" <tim.rudman@xxxxxxxxxx>
> > Subject: Re: Lith Printing Infrared Negatives
> >
> > - ----- Original Message -----
> > From: Tala Brandeis <brandeis@xxxxxxxxxxx>
> > To: <infrared-digest@xxxxx>
> > Sent: Tuesday, December 07, 1999 5:17 PM
> > Subject: Lith Printing Infrared Negatives
> >
> > > I've been experimenting with different mixes of chemistry
> > > and lith printing on different papers and a range of
> > > temperatures.  When printing Agfa Portriga Rapid at times
> > > I obtain an image that loses sharpness rather visibly.
> > > The effect seems to depend on the amount of silver halide
> > > solvent in the soup and/or temperature of the soup.
> > >
> > > Any one else out there who may have experienced the
> > > degredation of sharpness in an image while lith printing?
> > >
> > >
> > > Tala
> > > brandeis@xxxxxxxxxxx
> >
> > I don't use Portriga for lith but if you exhaust your lith dev too much
or
> > replenish too often you will get even severe loss of image quality Tala
> > Tim
> >
>
> Tim:
>
> Thanks for the reply.
>
> So, what's at work here chemically...
> Would I be correct in assuming the exhausting of the developer
> and resulting image degradation is the result of increased bromide?
> What is the contributing factor in replenishment... again an increase
> in bromide?
>
> Tala

Yes, rising bromide levels - from the paper emulsion, falling pH, falling
sulphite and HQ---
unless of course you have replenished or added other agents which may
complicate this a bit.

(there's a chapter on it in the book ;-))
nothing heavy)

Tim


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