Re: Lith film

I think the trick is that all of these processes use a staining
developer and have higher UV densities (effective printing density)
than the strictly visual density might indicate. I know they all use
the bare minimum of contrasting agent in their printing.

But the stain may not me the only answer. Another worker has recently
sent me some actual curve data using lith film and a modified version
of the Soemarko LC-1 developer that show a very straight line response
all the way from a minimum density of 0.30 to a maximum density of 4.0.
  He is still working on some final tweaking of the formula, but the
preliminary data I have seen show a very nice linear continuous tone
response. I'll let him decide when and where to reveal all, but I think
he typically 'listens' to this list and he may chime in..

Clay
On Dec 11, 2003, at 11:18 AM, Sandy King wrote:

> Irrespective of the question of whether or not you can get a density
> range of 3.2 with lith films, which by the way I know is possible from
> my own work, why in the world would anyone need a negative with such
> an extreme density range. Pt/Pd requires a negative DR of only from
> around 1.4 to 1.8.
>
> Sandy
>
>
>
>
>
>> Clay,
>>
>> I checked it. The link shows an abstract rather then a paper. No
>> process mentioned, no curves.
>> I believe you saw Pt/Pd print made with PMK processed lith film. I
>> also believe they retain all the subtleties in tone that you could
>> want for this process. What I hardly believe, is that this was
>> printed without contrasting agents. I want my neg to suit my process.
>> Therefore I need a density range (w/ or w/o stain) adapted to pure
>> palladiotype.
>> My point is: there is no lith film / developper combination that will
>> provide that 3.2 density range (visible light density).
>> My tests and curves I received today confirm that.
>>
>> Philippe
>>
>> -----Original Message-----
>> From: Clay [mailto:wcharmon@wt.net]
>> Sent: Thursday, December 11, 2003 16:03
>> To: alt-photo-process-l@skyway.usask.ca
>> Subject: Re: Lith film
>>
>>
>> I really don't agree that the lith film approach is a total dead-end
>> for making enlarged negatives. I have seen real-life results from
>> several workers (e.g. Stuart Melvin, Bob Herbst, Michael Kravit) who
>> are producing long scale pt/pd type enlarged negatives using APHS
>> that are very fine indeed, and retain all the subtleties in tone that
>> you could want for this process. Naturally, it takes a little
>> practice and a lot of care, but dismissing this approach completely
>> is a little premature. For instance, check out :
>>
>> http://www.bostick-sullivan.com/Technical_papers/
>> Stuart%20Melvin's%20Pyro%20System.html
>>
>>
>> Clay
>
Received on Thu Dec 11 11:44:01 2003