[alt-photo] Re: gum curve question

C.Breukel at lumc.nl C.Breukel at lumc.nl
Thu Aug 19 13:26:04 GMT 2010

Cannot help you on the curves, I am afraid, I work all analogue. I do
know when you work with a pretty exhausted/ weak developer such as LC1
the resulting image is quite brown, and I had the feeling that this
brown  colour blocked the UV light also, just like a Pyro stain does. I
never tested this, jus a feeling..

I use APH lith film (rarely) as an in camera negative, and have done
some direct reversal a la Liam Lawless with it (see his articles in

I do have enough stock, but throwing out usable stuff is a pitty..;-)..



> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> photo-process-list-bounces at lists.altphotolist.org] On Behalf Of henk
> Sent: donderdag 19 augustus 2010 14:42
> To: The alternative photographic processes mailing list
> Subject: [alt-photo] Re: gum curve question
> Hi Cor,
> Yes, i am aware of the problems, i used the film 'ages ago' with
> ten times diluted, and i could use the results.
> But at that time i used interpositives made on Ilford multigrade -
grade 0
> or 1 when i remember well- , but now the interpositive is made by
> printing, and my question was : what about the difference in light-
> blocking . Is there some curve, or is it ok to make a fairly less
> contrasty digital  positive.
> Just wondering about if the 'UV-light-inkjet-blocking' is also true
> 'normal light'.
> But ok, if i am wasting my time , i will contact you ..... but in what
> do you use the stuff?
> regards,
> Henk
> ps i will check the article; still a valuable source of information.
> ------------------------------------
> www.thijs-foto.com
> ------------------------------------
> On 19 aug 2010, at 10:38, <C.Breukel at lumc.nl> <C.Breukel at lumc.nl>
> > Henk,
> >
> > I think it will be hard to get a continuous scale/tone out of APHS
> > as you know this is a lith film, essentially black or clear, to get
> > continuous tone out of it you'll need something like LC-1 developer,
> > even than you'll get a somewhat weird curve (I believe they are in a
> > small article I wrote once for Judy's JPFP journal), so I think it
> > be hard to "transfer" the digital curve to the film curve..
> >
> > Best,
> >
> > Cor,
> >
> > Ps if you want to throw the film away I would gladly take it..;-)..
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