From: Scott Walker (walker@sympatico.ca)
Date: 07/27/03-08:10:21 PM Z
In the literature this dye was considered "uniquely qualified" for achieving
a panchromatic emulsion. At the time I could not find any other dye
combinations that claimed the spectrum that Orthochrome T does. Why do you
say Quasi?
I coat in complete darkness with two methods. I have physical templates
with guides and holders which I practiced with straight gelatin in the light
first, using coating rods. When I have filled the templates they go into the
(Dark fridge).
The second method is a washed and subbed glass in the spinner with a pump
that measures the gelatin onto the glass and the "spin off" hits the walls
of a plexiglass funnel that redirects the gelatin back into a bottle. This
whole contraption is inside a plexiglass cover that a fan draws air into
through a hepa filter.
I am considering trying a zero lux camera and illuminating with an IR spot
to see the process live.
Scott.
-----Original Message-----
From: Ryuji Suzuki [mailto:rs@silvergrain.org]
Sent: Sunday, July 27, 2003 9:44 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Bromo-iodide Silver Gelatin Emulsion as an Alternative
process
I asked these before, but I didn't hear the ansers...
1. What's so special about this particular dye? There are several
other dyes that can be used for silver gelatin process, which are
available from standard lab chemical supply companies, and I don't
know why one might want to go through trouble to get that
particular dye.
2. How do you mix and coat the quasi-panchromatic material without
automation?
-- Ryuji Suzuki "Reality has always had too many heads." (Bob Dylan, Cold Irons Bound, 1997)
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