Kees,
I use 14 baume ready gum solutions (about 30% as I recall), so it is the same as yours 1:2.
Marek
> Date: Thu, 23 Oct 2008 09:20:44 +0200
> From: ctb@zeelandnet.nl
> Subject: Re: Stock Paint:Gum Solutions?
> To: alt-photo-process-l@usask.ca
>
> Hi Loris, Chris, Marek, Katharine,
>
> Are you all using a 1:2 gum mix? Otherwise we are comparing different
> mixes.
> My stock solutions are more or less the same as Marek's, a 15ml tube
> in 150ml gum (1:2 from lumps).
>
> kees
>
>
>
> On 23 okt 2008, at 03:07, Marek Matusz wrote:
>
> > Loris,
> > I found that using stock solutions is the way to go to get
> > consistency. As Chris noted modern organic pigments do not separate
> > and stay suspended in gum solutions forever, just a little shake and
> > you are ready to go.
> > My thalo blue stock is 15 ml tube (Daniel Smith) to 150 cc of gum.
> > Magenta, which is quinacridone rose (PV19) is 1 tube to 120 cc of
> > gum, my standard yellow now is PY150 and it is 1 tube to 300 cc of
> > gum. I have to say I did not use PY151 that you mention and Daniel
> > Smith does not carry it. Most of other colors that I use require
> > about 150cc of gum for proper balance. ANother color that is very
> > strong is PR254 (Ferrari red), I have a stock of 1 tube to 300 cc.
> > If you do not want to mix that much stock you can mix it with 150
> > and at 1 part of gum for printing. I add 0.3 to 0.5 part of
> > saturated ammonium dichromate to 1 part of gum/pigment. I found no
> > compelling reason to add more and then wash it down the sink. I add
> > 1 part of water for 1 part of gum. This dictates the thickness of
> > gum in a finished print and would change somewhat depending on paper
> > absorbency. Lastly, I measure my gum solution and pour the exact
> > amount for a given negative size, for eample 8.5x11 requires 3cc of
> > sensitizer for my paper (Fabriano Artistico).
> > If you have 10 prints to do just mix a batch and measure a
> > predetermined amount for each print. My workflow is to do a single
> > colour is a session, which is 2-3 hours and allows for 8 to 12
> > prints. So tonight is magenta night.
> > You do have very similar cyan and magents dilutions and as I noted I
> > did not ever use your yellow. I seems that your concentrations would
> > be about 2x as much as I use and that would give you very strong and
> > saturated prints, somewhat difficult to balance midtones, higlight
> > and shadows in my opinion. AT these concentrations I run into some
> > stain issued. I prefer to work in somewhat weaker layers and add
> > pggment in more then 3 layers, on the average say about 5. You can
> > always improve a prints that is too light with another layer or two
> > or three.
> > You are a fast learner and progressing well.
> > Marek
> >
> > > Date: Wed, 22 Oct 2008 08:13:39 -0600
> > > From: zphoto@montana.net
> > > Subject: Re: Stock Paint:Gum Solutions?
> > > To: alt-photo-process-l@usask.ca
> > >
> > > OK this is it--one last email before I get on the road. Have to
> > teach a gum
> > > workshop in Missoula MT 200 mi away and I have to have my hubby
> > drive me
> > > there because I can't drive with a knee brace. He has to sit in a
> > town for
> > > two days entertaining himself so you can imagine he's one happy
> > camper.
> > >
> > > I mix all pigments 15ml tube in a total volume of 60ml because
> > that is the
> > > size nalgene bottles I have.
> > >
> > > At time of use I cut my pigments with plain gum--thalo gets cut as
> > much as
> > > 1+5, yellow maybe 1+2, magenta maybe 1+3, depending.
> > >
> > > Stock solutions are a cinch to use, and I only have problems with
> > the heavy
> > > pigments which settle and separate into a sludge on the bottom--
> > nickel
> > > titanate, cerulean, cadmiums. Since I no longer use these colors,
> > mixing
> > > stock is not a problem for me as far as separation is concerned.
> > >
> > > I think your thalo may be too concentrated, but I notice a
> > progression of
> > > yellow-magenta-thalo which I also do as far as strength.
> > >
> > > One more thing--at time of use I may decide to do an
> > undersaturated print,
> > > too, in which case I cut all pigments way more.
> > >
> > > There are several list members who have this down to a real
> > > exactitude--Marek, Dave Rose used to, and they'll tell you exactly
> > how much.
> > > OH, you could do a search for Dave Rose's posts a few years back
> > but he did
> > > use powdered pigment.
> > > Chris
> > > __________________
> > >
> > > Christina Z. Anderson
> > > http://christinaZanderson.com/
> > > __________________
> > > ----- Original Message -----
> > > From: "Loris Medici" <mail@loris.medici.name>
> > > To: <alt-photo-process-l@usask.ca>
> > > Sent: Wednesday, October 22, 2008 7:56 AM
> > > Subject: Stock Paint:Gum Solutions?
> > >
> > >
> > > >I was reading handprint.com's "The Secret of Glowing Color" page,
> > which
> > > > contains very good and interesting information, especially in
> > the section
> > > > "Not Black, Not Light".
> > > > (http://www.handprint.com/HP/WCL/tech16.html)
> > > >
> > > > I slowly feel the need of making stock paint:gum solutions, in
> > order to
> > > > get more consistency and ease of use. Mixing small amounts of
> > paint:gum
> > > > solutions is hard to do consistently, especially with strong
> > colorants and
> > > > small image sizes. (Because squeezing small amnt. from the tube
> > is not
> > > > easy!)
> > > >
> > > > I decided to make stock solutions as listed below:
> > > >
> > > > Yellow PY151 1:2 (1:4 final) -> 15ml paint + 30ml gum
> > > > Magenta PV19 1:3 (1:6 final) -> 15ml paint + 45ml gum
> > > > Cyan PB15:3 1:4 (1:8 final) -> 15ml paint + 60ml gum
> > > >
> > > > Since the stock paint:gum is further diluted 1:1 with
> > dichromate, the
> > > > actual paint dilution in the coating solution will be exactly
> > the half of
> > > > what it is in the paint:gum solution. (See inside parenthesis.)
> > > >
> > > > This question goes to users of stock paint:gum solutions (such as
> > > > Katharine and Christina):
> > > >
> > > > Do you find above figures close to ideal? What is your
> > experience with
> > > > those pigments? Anything to pay attention / be careful about using
> > > > paint:gum stock solutions?
> > > >
> > > > Thanks in advance,
> > > > Loris.
> > > >
> > > >
> > >
> > >
> >
> >
> > Stay organized with simple drag and drop from Windows Live Hotmail.
> > Try it
>
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