the more pigmented test consists of two sets. One developed for a short peroid of time, 20-30 minuts, second a very long development, hours, perpas 6 hours. You can see the dichromate stain in the short development. The less pigmented gums also consist of two sets with same development. You can easlily see much darker dichromate stain in these. Is it just because there is less pigment so you can simply see the stain?
I was trying to have exposure timme/development/pigment decoupled in these experiments. SO if for example someone says less pigment needs more exposure (or less) I have done it or more development, done.
Marek
> Date: Fri, 16 Jan 2009 15:34:57 -0800
> From: kthayer@pacifier.com
> Subject: Re: Printing gum with little pigment
> To: alt-photo-process-l@usask.ca
>
> Umm, thanks, but that still doesn't answer my question, sorry. Are
> the less-pigmented strips developed the same as the more-pigmented
> strips, was my question.
> kt
>
>
> On Jan 16, 2009, at 3:09 PM, Marek Matusz wrote:
>
> > Katharine,
> > Long development might be 4 to 6 hours and I tend to swoosh my
> > prints in the water too. My typical development is 15-30 minutes.
> > Marek
> >
> > > Date: Fri, 16 Jan 2009 13:59:39 -0800
> > > From: kthayer@pacifier.com
> > > Subject: Re: Printing gum with little pigment
> > > To: alt-photo-process-l@usask.ca
> > >
> > > Hi Marek, thanks for posting these. I will probably have more to say
> > > about this later, because the issue of pigment and tonality has been
> > > on my mind for quite a while too, but first a point of
> > > clarification: what do you mean by "long development" written on the
> > > lesser pigent test strips; is this a different development than for
> > > the other (more pigment) case, or the same? Thanks. BTW, I think
> > > this is a good and useful issue for discussion, and thanks for
> > > bringing it up.
> > > Katharine
> > >
> > >
> > >
> > > On Jan 16, 2009, at 9:33 AM, Marek Matusz wrote:
> > >
> > > >
> > > >
> > > > Hi all
> > > > I was waiting for a dry spell to bring this up. A while back Judy
> > > > made a statement that printing gum with little or no pigment
> > allows
> > > > for a very extended range. I looked back through the Post Factory
> > > > issues and really could not find examples. Hey Judy thanks for
> > > > sparking my interest.
> > > > Since I was messing around with the post-flash and was getting
> > good
> > > > results in extending tonal range of the print I decided to do some
> > > > experimentation and actually print some test prints.
> > > > http://picasaweb.google.com/marekmatusz1/ExtendedGumRange#
> > > >
> > > > Two sets of tests are done with same water/gum/dichromate but
> > > > different pigment concentrations. I have made different exposures
> > > > and tested two development times. I used indantrone blue which
> > is a
> > > > wonderful dark blue and non-staining. I can not see that low
> > > > pigment concentration extends the rane of gum print, to the
> > > > contrary it allows less steps to be separated on a standard step
> > > > tablet. One of the tests is also a good illustration of how
> > > > delicate highlights with dark shadows can be printed with the same
> > > > negative with the postflash.
> > > > Anybody else want to chime in. It would be great to see some
> > > > illustrations. A picture is worth a thousand words.
> > > > This contrast vs. pigment issue has been on my mind for a while.
> > > > Marek
> > > >
> > > > Windows Live™ Hotmail®: Chat. Store. Share. Do more with mail. See
> > > > how it works.
> > >
> >
> >
> > Windows Live™ Hotmail®: Chat. Store. Share. Do more with mail.
> > Check it out.
>
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