U of S | Mailing List Archive | alt-photo-process-l | Re: Printing gum with little pigment

Re: Printing gum with little pigment

Marek, I found another step print with Prussian, more concentrated
than the other two, and added it to the visual. It also printed
exactly 7 steps, just as the other two did. As I said before, these
are just three isolated strips, not a planned or controlled
experiment, but as a supplement to your data, they seem to add to the
chorus. I also added reflection density readings for the three
strips, in case anyone is having trouble with the idea that there's
no correlation between # steps and tonal range for gum. This has got
me thinking and scratching my head, but sure darn interesting.
Thanks for asking the question,

Oh, here's the link again:

P.S. I decided not to upload those other strips I mentioned, with the
overpigmented pthalo; since they addressed a different question, I've
decided they'd just be confusing here.

On Jan 22, 2009, at 9:26 AM, Katharine Thayer wrote:

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

On Jan 19, 2009, at 5:40 PM, Marek Matusz wrote:

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.

> 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
> > way for you to convince yourself of the validity of your
> > 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
> 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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