U of S | Mailing List Archive | alt-photo-process-l | Re: Types of Gum? Dyes instead of pigments?

Re: Types of Gum? Dyes instead of pigments?

I know of a couple of people who, at least a couple of years ago, were using gum tragacanth, or maybe a mixture of gum tragacanth and gum arabic because they thought it worked better for holding gum to glass or metal. But I don't know any more about it than that.

On Oct 16, 2007, at 6:54 AM, sam wang wrote:

Hi Jacek,

The points are all very interesting and worth asking.

Sounds like you have your job cut out for you in testing and finding the answers, since I don't think they are easy to answer without "elbow grease", the hard work of trying them out in somewhat controlled environment.

Good luck. And please let us know about your results.

Sam Wang

On Oct 14, 2007, at 11:13 PM, Jacek wrote:

Hi all,

I was wondering if anyone used another form of a binder in Gum Bichromate printing. Most of the sources I've read have all used Gum Arabic, though there are many other that exist Gum tragacanth,Guar Gum, Locust Bean Gum, Tara Gum, Xanthan Gum etc.
Perhaps a different gum might hold more pigment or give another aesthetic result?

Other than using watercolour pigments, has anyone tried using dyes? I presume that a pigment is a insoluble powder, when using gum and exposing to light the pigment is trapped, where a dye used perhaps the gum can't trap the soluble liquid? Though is it possible to take a dye and make it into a pigment? Silly question perhaps? :) I had this idea to use plant dyes for my colours, wondering if its feasible or not?