From: Katharine Thayer (kthayer@pacifier.com)
Date: 07/02/02-02:11:26 AM Z
The post I sent earlier hasn't come through yet but I wanted to add that
I did try my own tests with pyro, some months back, but wasn't able to
convert much of the silver to stain so I didn't get a true pyro-stained
negative to test. My negatives were really just silver negatives for all
intents and purposes, and it's the stain I'm interested in, how that
prints on gum. (And thanks, but helpful instructions on how to improve
my pyro technique are likely to be wasted on me since once I left off
with it I'm not likely to go back and work with it any more. I'm
curious, but since it's purely intellectual curiousity and the answer
isn't something I need for my own practice, I'm not curious enough to
spend a lot of time on it.)
Katharine
Breukel, C (HKG) wrote:
>
> Hi all,
>
> Thought I could share some initial results on my tests with gum over
> Kallitype with a Pyro negative (I believe Katharine Thayer inquired
> about using a Pyro negative for gum?)
>
> The negative is a 4*5 inch MACO 820IR film (yes infrared film) processed
> in PMK Pyro. Got some realy excessive stained highlights, not realy
> uncommen with Infrared.
>
> Printing it on silver gelatine, VC, asked for excessive burning of the
> highlights (tree leaves) of 2 stops with a filter 1 over the base
> exposure (2 1/2).
>
> Pre-shrunk and foam-brush sized (1.4% gelatine/Alum harded) Fonteney
> paper was used.
>
> Initial print was a slightly under exposed Kallitype (as written up by
> Peter Marshall, originally by Thompson, see B&S web site for protocoll).
> Printing time was relative excessive: 20 min, wheras a non Pyro neg
> would usually print in the 5-15 min range.
>
> Gum print was aimed at "filling in" the higlights: mixture 0.5 ml gum,
> 0.02 gram (!, long live the micro balans) Burnt Sienna and 0,5 ml
> PotDichromate.
>
> (BTW I realy wonder how people can maintain registration: even after a
> pre-shrink step, and using only 4*5 I could not obtain perfect
> registration)
>
> Printing time was again excessive (no surprise, taking the heavy stain
> in account) : 40 minutes (in my setup a gum print usually prints in the
> 5-10 min range). Overnight soak to clear (probably shorter would also
> work, this was just covenient)
>
> The resulting print was actually quite pleasing: shadow/mid tone black
> grey, high mid tone/highlights light yellow.
>
> So, yes one can make a gum print ffrom a Pyro negative, at the expense
> of long printing times. Not a realy shocking discovery, but nevertheless
> of interest I hope.
>
> Best,
>
> Cor
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