Re: gum mixes
I mix my own. 300g PLUS I litre of water. I use 13g of K2Cr2O7 with
distilled water to make a total volume of 100ml. When I use this I always
make sure there are no crystals before use which is only really the winter
months when the heating isn't on.
I use 1:1 gum/K2Cr2O7 for my base exposure then change the ratios for
highlights and shadows. I can normally get a print from 3 layers of gum.
----- Original Message -----
From: "Christina Z. Anderson" <firstname.lastname@example.org>
Sent: Sunday, December 23, 2007 6:18 PM
Subject: gum mixes
I'm finishing my section on gum thicknesses, and was wondering a question
or two of all one-time to inveterate gum printers:
1. How many of you are using premixed gum?
2. If not and you are mixing your own, what dilution are you mixing it
at exactly--weight of gum into what volume of water, for instance? If it
is 300g in a TOTAL volume of 1 liter, or 300g PLUS one liter please
differentiate clearly. If, mixing more than one solution, also state. If
not using gum/pigment 1:1 sensitizer at time of use please note.
Any other practices, I'd love to hear--e.g. using a hydrometer or some
such thing. Or if you use dry gum at time of use in your sensitized mix
and do not premix a gum solution. Stuff like that. I've got the timeline
almost finished on gum dilutions from beginning til now and I want the
"now" as in 2007. Hopefully this isn't too pointless, misleading, and
Christina Z. Anderson
Photo Option Coordinator
Montana State University
Bozeman, MT 59717
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- gum mixes
- From: "Christina Z. Anderson" <email@example.com>