RE: gum mixes

["Weber, Scott B" <sweber@mail.barry.edu>]

On the subject of gum. After seeing the gum prints in last years traveling portfolio (not to mention all this chatter about gum on the list) I have decided to give it a try. I will start with the formulas in Christopher James book, The Book of Alternative Photographic Processes. Any recommendations or warnings?
Thanks,

Scott B. Weber
Associate Professor of Photography
Department of Fine Arts
Barry University
11300 NE 2nd Avenue
Miami Shores, Florida 33161
(305) 899 4922

-----Original Message-----
From: Keith Gerling [mailto:keith.gerling@gmail.com]
Sent: Saturday, January 05, 2008 12:35 PM
To: alt-photo-process-l@usask.ca
Subject: Re: gum mixes

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
> >>
> >>
> >
> >
> >
>
>
>