From: Stuart W Melvin (swmelvin@earthlink.net)
Date: 07/25/03-09:23:21 AM Z
Hey all,
I also use variables other than Dichro to control contrast in various
coatings. Obviously two coatings comprised of identical ingredients with the
exception of pigment, one being of a light color (say gold ochre) and the
other being of a darker, richer pigment (say prussian blue), will produce an
appearance of differing contrast levels simply due to the fact that the
fully exposed shadows of the deeper blue coating will be heavier relative to
the high values and paper white than the yellow ochre could possibly
produce. The variations of Dichro percentages is simply an additional tool
to employ. No more-No less.
Reiterating-ly
Stuart
-----Original Message-----
From: Katharine Thayer [mailto:kthayer@pacifier.com]
Sent: Thursday, July 24, 2003 12:56 AM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: News from APIS
Stuart W Melvin wrote:
>
You
> will see a very hard line high contrast result that certainly could not be
> achieved with a 30% Ammonium Dichro solution "dry" OR "saturated". The
> latitude of the variables is what determines the amount of artistic
license
> one possesses. Choice is freedom. One or two bottles of saturated solution
> at one or two percentage levels on the shelf dose not facilitate much
> choice.
Hi Stuart,
I agree with the principle that the latitude of the variables
determines artistic freedom. However, I disagree with the assertion that
using one or two strengths of dichromate limits a gum printer's freedom
of expression. I have always used saturated ammonium dichromate
exclusively, but I get a full range of contrast by varying other
variables. There's almost always more than one way to achieve a
particular end in gum, is what I'm saying. Also, Dave Rose's work is
just one example of what can be accomplished with a couple of saturated
dichromate solutions.
I've also come to believe that the light source has a lot to do with it;
people using a brighter and hotter UV source than I use may not find
saturated ammonium dichromate as flexible for them as it is for me.
Things more often than not depend on other things, is what I've found to
be true in gum printing.
Katharine Thayer
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