Re: Printing gum with little pigment
You're welcome, although I'd caution that this is just two unrelated
step tablets that I pulled out of a box that happened to be made
using the same pigment at different concentrations, not anything
that could be called a proper test. I wouldn't put too much weight
on it, but yes, these two step prints do seem to support your
observations. Like you, I wish more people would provide actual
step prints with exposure and development info, to add to the
database of information on this rather fundamental question.
Katharine
On Jan 19, 2009, at 5:40 PM, Marek Matusz wrote:
Thanks,
This is exactly was I found and was trying to illustrate and
totally agrees with my observations. I was hoping more people would
chime in with their illustrations on the subject.
Marek
> Date: Sat, 17 Jan 2009 17:25:15 -0800
> From: kthayer@pacifier.com
> Subject: Re: Printing gum with little pigment
> To: alt-photo-process-l@usask.ca
>
>
> On Jan 16, 2009, at 3:05 PM, Marek Matusz wrote:
>
> > Loris,
> > Here is where the argument breaks down. What you consider a weak/
> > moderate pigment I might be using and defining as strong. The only
> > way for you to convince yourself of the validity of your
assumption
> > is to cut the pigment concentration in half or quarter and print
> > something side by side. I am looking for people that have done it
> > already and can share the actual prints/test strips.
>
> Okay, this is all I found in an afternoon of searching through boxes
> of test strips and test prints, that would serve the purpose. It
> would have taken me less time to just go down and print some, but I
> don't want to go down there; it's cold. . :--) Anyway, here is a
> comparison of two Stouffer 21-step prints in Prussian at two
> different pigment concentrations; it is consistent with your
> observations. These would have been exposed and developed in a way
> to yield the optimal DMax and maximum number of steps for each mix,
> per the instructions on my site.
>
> http://www.pacifier.com/~kthayer/html/pigcomp.html
>
> Hope that's useful,
> Katharine
>
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