Re: gum mixes

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

Chris,

In an attempt to remove some of the loosey from the goosey, I've mixed
up another batch, kept track, and it's really simple:  100 grams of
powdered gum to 125 ml water.

Keith

On Jan 3, 2008 9:01 PM, Christina Z. Anderson <zphoto@montana.net> wrote:
> Thanks, y'all, for clarifying--whew!  I was really wondering there for a
> moment.
>
> And thanks for the rest of the responses, too.  Keith--I'm describing yours
> as "loosey-goosey" :)  or the "intuitive" method of gum printing--going by
> feel.
>
> Any of you do the heavy gum mix/lighter exposure/runny impressionistic one
> coat French method?
> Chris
>
>
> ----- Original Message -----
> From: "Henry Rattle" <henry.rattle@ntlworld.com>
> To: <alt-photo-process-l@usask.ca>
> Sent: Thursday, January 03, 2008 9:54 AM
> Subject: Re: gum mixes
>
>
>
> > Hi Christina,
> >
> > For my method (8) the gum mix is right but then it's 5ml gum mixed with
> > small blob of pigment (using flexible palette knife on a small tea-plate)
> > and then 5 ml potassium dichromate added. No additional water. The
> > resulting
> > 10 ml is enough to coat 5-6 sheets of sized paper for about 7x9 inches
> > image, using a hake brush.
> >
> > Best
> >
> > Henry
> >
> >
> > On 3/1/08 14:23, "Christina Z. Anderson" <zphoto@montana.net> wrote:
> >
> >> Dear all,
> >> So this is what I have so far--only 10 gum printers on the list
> >> apparently
> >> :)
> >> The range of practice of gum never ceases to amaze me. In historical
> >> times
> >> it was 10% gum to 100% gum (the latter was mixed 1 gum powder to 1
> >> water--I
> >> know, it is not technically a 100% solution but that was what they termed
> >> it
> >> in those days--in other words, a 40% solution was 40g gum PLUS 100ml
> >> water,
> >> not in a total combined volume of 100ml.
> >> Some questions:  Marek, do you use dry am di at time of use?  Henry and
> >> David, at time of use you mix essentially a half strength potassium
> >> dichromate and am I correct with your 1 di: 1 water: 10 (!) gum?  How
> >> long
> >> are your exposures and are they in the sun? Guido, same thing--do you use
> >> that little potassium dichromate in your mix--essentially 1-5 parts gum
> >> to
> >> only 1/2 part pot di? If I have anyone's info wrong, let me know.
> >> Chris
> >>   1.. Sam Wang 1+2 powdered and at time of use 1:1 with dry am di
> >>   2.. John Brewer 3+10 powdered, preserved with 15ml formalin per liter,
> >> at
> >> time of use 1:1 mix, changing this ratio for highlights and shadows
> >>   3.. Kees Brandenburg 3+10 LUMP which he says is 14 baume and at time of
> >> use 1:1
> >>   4.. Marek Matusz premixed gum, stock pigment mixes of 1 tube pigment in
> >> 120ml gum and  at time of use 3pt gum/pigment to 3 pt water to 1 part AMT
> >>   5.. Joe Smigiel is premixed 14 baume and at time of use 1:1 pot di,
> >> tube
> >> pigments, sometimes powder pigments, sometimes mica or interference
> >> pigments
> >>   6.. Bill Mull is premixed gum and stock pigment made with gouache at 6
> >> gum: 1 gouache and at time of use 1:1 pot di and one coat gums made with
> >> paper negs
> >>   7.. Hamish  premixed gum and stock pigment solutions and at time of use
> >> 1:1, but sometimes 1:2
> >>   8.. Henry Rattle 70 to 200 Kordofan No. 1 LUMPS with few drops formalin
> >> and at time of use 1 di: 1 water: 10 gum
> >>   9.. Guido Ceuppens 200g to 850 water with 5gr sodium benzoate with
> >> stock
> >> pigments of 1 g watercolor tube: 6ml gum and at time of use 1 part
> >> stock:0-4
> >> parts gum:0.5 pot di
> >>   10.. David Hatton 500g + 1 liter with 10 drops 100% thymol and at time
> >> of
> >> use 1 pot di:1 water:10ml gum with varying amounts of pigment depending
> >> on
> >> layer, color
> >> ________________
> >> Christina Z. Anderson
> >> Assistant Professor
> >> Photo Option Coordinator
> >> Montana State University
> >> Box 173350
> >> Bozeman, MT  59717
> >> 406.994.6219
> >> CZAphotography.com
> >>
> >>
> >
> >
> >
>
>
>