On Oct 22, 3:05 pm, "Richard Knoppow" <dickb...@[EMAIL PROTECTED]
> wrote:
> "Jean-David Beyer" <jdbe...@[EMAIL PROTECTED]
> wrote in
> messagenews:slrnfhnkan.2sa.jdbeyer@[EMAIL PROTECTED]
>
>
>
> > On 2007-10-21, Richard Knoppow <dickb...@[EMAIL PROTECTED]
>
> > wrote:
>
> >> "piterengel" <pslavi...@[EMAIL PROTECTED]
> wrote in message
> >>news:1192991717.030130.83460@[EMAIL PROTECTED]
> >>> Hi, becaise it no more possible to find lith film I need
> >>> to try with a
> >>> qute common film to obtain very high contrasted
> >>> pictures.
> >>> I have Efke
> >>> KB 25 and Rollei PAN 25 at home. Can anybody suggest a
> >>> developer to
> >>> have extremely contrasted subjects?
> >>> Thanks all
> >>> P.
>
> >> The highest contrast is gotten using a lithographic
> >> developer like Kodak D-85 which produces "infective"
> >> development. However, D-85, and similar developers, use
> >> Formaldehyde, which is nasty stuff.
>
> > I use Kodak litho film (not much) and one of their litho
> > developers.
> > It does not contain liquid formaldehyde, but
> > paraformaldehyte that
> > is a related compound. J.T.Baker have this to say about
> > it:
>
> >http://www.jtbaker.com/msds/englishhtml/p0154.htm
>
> > As far as I can tell, I have never had any trouble with
> > the mixed
> > working strength developer.
>
> >> There are somewhat lower
> >> contrast developers, like Kodak D-8, using Hydroxide,
> >> which
> >> produce very high contrast but not quite what a true
> >> lithographic developer gives. I don't think a lith
> >> developer
> >> is needed unless you are doing true line work.
> >> Lith film is still made but I don't know where to get
> >> it
> >> outside of the US.
> >> For pictorial purposes a print developer like Dektol
> >> will give you quite a bit higher contrast on film than
> >> the
> >> usual film developers but at the cost of being quite
> >> grainy.
> >> Since print developers are cheap and easy to obtain I
> >> would
> >> try one first to see if the contrast is high enough.
>
> > --
> > .~. Jean-David Beyer Registered Linux User
> > 85642.
> > /V\ PGP-Key: 9A2FC99A Registered Machine
> > 241939.
> > /( )\ Shrewsbury, New Jersey http://counter.li.org
> > ^^-^^ 18:20:01 up 15 days, 1:56, 1 user, load average:
> > 5.22, 5.55, 5.14
>
> Actually, D-85 uses paraformaldehyde, which is a
> crystaline form and becomes formaldehyde in solution. It is
> a two solution developer, the two parts being mixed just
> before use. I don't know if there is a more environmentally
> friendly substance that can be used in stead of the
> paraformaldehyde. Its function in the developer is not as a
> hardener but specifically to promote infectious developemt.
> This causes dense areas to develop much more rapidly than
> lower densities resulting in exagerated contrast. For the
> most part lithographic developers were used for line work
> where the negative needed to be either very high density or
> clear. Lith developers are also currently used for lith
> printing. This is a sort of special effect which has become
> popular in the last decade or so. A Google search for lith
> printing will give you lots of hits.
> For just higher than normal contrast on pictorial film I
> think less extreme developers will work fine. One can use
> something like Kodak D-8 or D-11 but, as I mentioned before,
> probably any print developer will be enough.
>
> --
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickb...@[EMAIL PROTECTED]
've already tried ID-13 with Ilford Delta 100 film to obtain "line
art" pictures but result was totally wrong. Maybe I've to use stronger
developer, with paraformaldehyde in composition, together with a low
sensibility film.
Thanks for all hints.
P.
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