Re: gum mixes
Hey Scott,
I had been doing gum over pt/pd, but some of the same reasons you
list here are also why I wanted to try gum printing (by itself). I
was having all sorts of problems, and then I looked at James' book
and followed his formula (and "prepared for success!"). I had no
problems after that, except for-- as ever-- attempting to locate the
perfect paper. One issue I've never liked with gum prints is the
grainy sort of look I always see, but that everyone keeps saying
doesn't have to be a given. I did notice that in the last portfolio
exchange, Don Bryant's gum prints, in particular, were smooth (not
grainy) and really lovely. Someone else had really smooth ones, too,
though I can't now remember who that was -- Marek maybe? Anyway,
Don was nice enough to mail me some paper he'd already sized, and the
paper he sent worked great. I'd been using glyoxal (sp?) with my
sizing, but Don uses glut. He thinks that makes the difference. I'm
not sure; all I know is, the prints were smooth(er). For me,
speaking only as a gum-printing rank beginner, there just seems to be
so many variables that the inconsistency can be very frustrating.
I'm probably still doing everything wrong, but I am keeping notes
now, and that does help. I'm hoping to include some in this next
portfolio round, but I'm also hoping we change the start date of that
from January to something closer to February 1. ??
Diana
On Jan 5, 2008, at 2:15 PM, Weber, Scott B wrote:
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
|