From: Breukel, C (HKG) (cor@lumc.nl)
Date: 07/02/02-02:42:01 AM Z
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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