Re: direct carbon or gum bleach development

[Keith Gerling <keith.gerling@gmail.com>]

Hi Marek,

My attempts look atrocious.  What kind of pigment are you using for this?

thanks!

Keith

On Dec 20, 2007 4:05 PM, Keith Gerling <keith.gerling@gmail.com> wrote:
> Awesome, Marek.  This is what I want MY prints to look like.  Forget
> all that multi-coat nonsense.
>
>
> On Dec 20, 2007 2:28 PM, Marek Matusz <marekmatusz@hotmail.com> wrote:
> >
> >  All,
> >  More experimentation with gum printing and bleach development.
> >
> >  I was intrigued by Loris's results with using unsized paper. I thought that
> > it would give a rather bad stain. My tricolor gum practice certainly led me
> > to believe this. However on numerous occasions I did observe that edges of
> > paper that I used which did not have gelatin size gave a darker, more
> > uniform black. SO last week I tried to use single sized paper, fresh and
> > unsized  Fabriano Artistico, and a throw away gum print that has been soaked
> > over and over, but had a reverse side of Fabriano paper quite clean. My
> > overall conclusion with this set of prints is that I liked unsized paper and
> > soaked paper best. They gave crispier prints. Perhaps this technique likes
> > the gum to be tied up with the fiber of the paper and the bleach development
> > can give clear paper base. So I would advocate use of straight watercolor
> > paper, no need to size. I have not tried any other brand, but I should have
> > some at hand and will try next printing session.
> >
> >  I have also experimented some more with pigment density. I had a more
> > concentrated carbon stock of 3.75% carbon in 14 baume gum, that is 50% more
> > then in my last set of experiments. The solutions are left over from dozens
> > or maybe hundreds of experiments done in the last two years. Once the water
> > dried out this would result in 3.75/0.27=14% carbon/solid gum mixture (I
> > assume 14 baume gum is 27%). This is definitely black black. Beautiful
> > velvety matte texture of the deep black to take your breath away. Scan of
> > the print here. This print was made on unsized Fabriano Artistico paper
> >
> > http://picasaweb.google.com/marekmatusz1/GumBleachDevelop/photo#5145909559997921266
> >  The mid tones are a little bit darker on this screen that in reality. Maybe
> > even the two tones of black on the very edge are visible. Very outside, had
> > most exposure (I uped the exposure to 6 minutes from last time) and next to
> > it is somewhat lighter edge from exposure through blank part of transparency
> > (Pictorico). This is a further illustration of how a fine tonal gradation
> > can be achieved with this method.
> >  I have also included an detail of the print scanned at 300 dpi:
> >
> > http://picasaweb.google.com/marekmatusz1/GumBleachDevelop/photo#5145909521343215586
> >  Happy printing
> >  Marek
> >
> >
> > ________________________________
> > Don't get caught with egg on your face. Play Chicktionary! Check it out!
>